sample.cs

using System.Text.Json;
using System.Text.Json.Serialization;


string json = """
              {
                  "2024-03-30": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 1
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 48,
                          "average_read_time_in_seconds": 231,
                          "total_read_time_in_seconds": 11088
                      }
                  },
                  "2024-03-31": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 0
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 99,
                          "average_read_time_in_seconds": 45,
                          "total_read_time_in_seconds": 4455
                      }
                  },
                  "2024-04-01": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 0
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 227,
                          "average_read_time_in_seconds": 212,
                          "total_read_time_in_seconds": 48124
                      }
                  },
                  "2024-04-02": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 2
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 348,
                          "average_read_time_in_seconds": 188,
                          "total_read_time_in_seconds": 65424
                      }
                  },
                  "2024-04-03": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 2
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 303,
                          "average_read_time_in_seconds": 620,
                          "total_read_time_in_seconds": 187860
                      }
                  },
                  "2024-04-04": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 0
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 305,
                          "average_read_time_in_seconds": 481,
                          "total_read_time_in_seconds": 146705
                      }
                  },
                  "2024-04-05": {
                      "comments": {
                          "total": 1
                      },
                      "follows": {
                          "total": 1
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 298,
                          "average_read_time_in_seconds": 302,
                          "total_read_time_in_seconds": 89996
                      }
                  },
                  "2024-04-06": {
                      "comments": {
                          "total": 0
                      },
                      "follows": {
                          "total": 0
                      },
                      "reactions": {
                          "total": 0,
                          "like": 0,
                          "readinglist": 0,
                          "unicorn": 0
                      },
                      "page_views": {
                          "total": 52,
                          "average_read_time_in_seconds": 23,
                          "total_read_time_in_seconds": 1196
                      }
                  }
              }
              """;

Dictionary<DateTime, Stats>? statsDict = JsonSerializer.Deserialize<Dictionary<DateTime, Stats>>( json );

List<StatsByDate> statsList = new List<StatsByDate>();
if ( statsDict != null )
    foreach ( var (key, value) in statsDict )
    {
        statsList.Add( new StatsByDate
        {
            ActualDate = key,
            Statistics = value
        } );
    }

foreach ( var item in statsList )
{
    Console.WriteLine( $"Date: {item.ActualDate}, Total Comm: {item.Statistics.Comments.Total}, Total Reactions: {item.Statistics.Reactions.Total}, Total pageViews: {item.Statistics.PageViews.Total}" );
}

internal record Comments
{
    [JsonPropertyName("total")]
    public int Total { get; set; } = 0;
}

internal record Follows
{
    [JsonPropertyName("total")]
    public int Total { get; set; } = 0;
}

internal record Reactions
{
    [JsonPropertyName("total")]
    public int Total { get; set; } = 0;
    [JsonPropertyName("like")]
    public int Like { get; set; } = 0;
    [JsonPropertyName("readinglist")]
    public int Readinglist { get; set; } = 0;
    [JsonPropertyName("unicorn")]
    public int Unicorn { get; set; } = 0;
}

internal record PageViews
{
    [JsonPropertyName("total")]
    public int Total { get; set; } = 0;
    [JsonPropertyName("average_read_time_in_seconds")]
    public int AverageReadTimeInSeconds { get; set; } = 0;
    [JsonPropertyName("total_read_time_in_seconds")]
    public int TotalReadTimeInSeconds { get; set; } = 0;
}

internal record Stats
{
    [JsonPropertyName("comments")]
    public Comments Comments { get; set; }
    [JsonPropertyName("follows")]
    public Follows Follows { get; set; }
    [JsonPropertyName("reactions")]
    public Reactions Reactions { get; set; }
    [JsonPropertyName("page_views")]
    public PageViews PageViews { get; set; }
}

internal record StatsByDate
{
    public DateTime ActualDate { get; set; }
    public Stats Statistics { get; set; }
}