https://docs.microsoft.com/en-us/dotnet/api/system.text.json.serialization.jsonsourcegenerationoptionsattribute.dictionarykeypolicy?view=net-10.0
JsonSourceGenerationOptionsAttribute.DictionaryKeyPolicy Property (System.Text.Json.Serialization)...
Gets or sets the default value of DictionaryKeyPolicy.
property systemtextjsonserialization