JsonPatch usage with Swagger UI support

Program.cs

using FastEndpoints.Swagger;
using Microsoft.AspNetCore.JsonPatch;
using Microsoft.AspNetCore.JsonPatch.Operations;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using NJsonSchema.Annotations;
using System.Text.Json;

var bld = WebApplication.CreateBuilder();
bld.Services
   .AddAuthorization()
   .AddFastEndpoints()
   .SwaggerDocument();

var app = bld.Build();
app.UseAuthorization()
   .UseFastEndpoints()
   .UseSwaggerGen();

app.Run();

public abstract class PatchRequest
{
    [JsonSchemaType(typeof(Operation[]))]
    public JsonElement[] Patches { get; set; }

    public void Patch<TModel>(TModel model) where TModel : class
    {
        var doc = new JsonPatchDocument(
            operations: Patches.Select(o => JsonConvert.DeserializeObject<Operation>(o.GetRawText())).ToList(),
            contractResolver: new DefaultContractResolver());
        doc.ApplyTo(model);
    }
}

public class UpdateUserRequest : PatchRequest
{
    public int UserID { get; set; }
}

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

public class UpdatePersonEndpoint : Endpoint<UpdateUserRequest>
{
    public override void Configure()
    {
        Patch("test/{UserID}");
        AllowAnonymous();
    }

    public override async Task HandleAsync(UpdateUserRequest req, CancellationToken ct)
    {
        var user = new Person { FirstName = "first", LastName = "last" };
        req.Patch(user);
        await SendAsync(user);
    }
}

Request.json

{
  "patches": [
    {
        "path": "/firstName",
        "op": "replace",
        "value": "Fast"
    },
    {
        "path": "/lastName",
        "op": "replace",
        "value": "Endpoints"
    }
  ]
}