TMPro's InputField component got white listed a while ago, however it seems trying to do anything with it isn't.
It doesn't seem to be exposed in Udon and it's still marked as prohibited when trying to send events to it via UI events.
The only thing it seems i can do with it is have a user input text, use OnEditEnd to pull the value directly from the TMP Text. You cant then remove the text from the InputField making it weird to use in game.