Example of a single column to set/get the Smart String status

GlobalSmartStringColumn.cs

using System;
using System.Collections.Generic;
using UnityEditor.Localization;
using UnityEditor.Localization.Plugins.Google.Columns;
using UnityEngine.Localization.Tables;

[Serializable]
public class GlobalSmartStringColumn : SheetColumn
{
    public override PushFields PushFields => PushFields.Value;

    StringTableCollection m_TableCollection;

    public override void PullBegin(StringTableCollection collection)
    {
        m_TableCollection = collection;
    }

    public override void PullCellData(SharedTableData.SharedTableEntry keyEntry, string cellValue, string cellNote)
    {
        // Pick a value for true and false. Lets do 1 is yes and anything else is false
        bool enableSmartString = cellValue == "1";

        // Go through all the entries
        foreach (var table in m_TableCollection.StringTables)
        {
            var entry = table.GetEntry(keyEntry.Id);
            if (entry != null)
                entry.IsSmart = enableSmartString;
        }
    }

    public override void PushBegin(StringTableCollection collection)
    {
        m_TableCollection = collection;
    }

    public override void PushCellData(SharedTableData.SharedTableEntry keyEntry, IList<StringTableEntry> tableEntries, out string value, out string note)
    {
        // Use the first table as our source of truth
        var entry = m_TableCollection.StringTables[0].GetEntry(keyEntry.Id);
        value = entry != null && entry.IsSmart ? "1" : string.Empty;
        note = null;
    }

    public override void PushHeader(StringTableCollection collection, out string header, out string headerNote)
    {
        header = "Smart String";
        headerNote = null;
    }
}