Add field with CustomFormatter

[Mruffo]

Category

• Bug

Describe the bug

I'm trying to add a field of type 'Choice' with a custom formatter (the simplest possible by Microsoft documentation), but I got an error:

"Name cannot begin with the '$' character, hexadecimal value 0x24. Line 1, position 157"

Steps to reproduce

Sample code:

   await library.Fields.AddChoiceAsync("Test", new FieldChoiceOptions()
                    {
                        AddToDefaultView = true,
                        Choices = new List<string>() { "Value1", "Value2", "Value3" }.ToArray(),
                        CustomFormatter = "{\"$schema\": \"https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json\",\"elmType\": \"div\", \"txtContent\": \"@currentField\"}",
                        DefaultChoice = "Value1"
                    });

Expected behavior

The field is added to the library with the right json formatting