Passing URL form parameters with new post submission

The "make new post" endpoint seems to accept parameters in order to prefill the form, such as https://kbin.social/m/mymagazine/new?url=foo. Are there parameters for the other fields? E.g., ?url=foo&title=bar&body=baz? Tried various incantations to no avail, and didn't find them when picking through the codebase, either.