Base type conversion

[Frosin]

Hello, thanks for the great library! Tell me how you can take the base type of the field and not its actual type when converting to map? For example, if there is a var customString string type and a myStruct {Key string 'json:" key '} structure, then after conversion there will be a map [key: string] value: customString structure, how can I make the output look like this: map [key: string] value: string?