Project fields

There is no information about GET /v1/projectFields in the API documentation, but I can make a request there using the API token.
Unfortunately, I can’t make such a request using an OAuth Access Token because my app settings don’t have a scope like “Project Fields: Full access”.
I can’t use API tokens in my app, only OAuth

Why isn’t there such an option? And is it possible to add it if such a route already exists in the API?