Shouldn't there be an option for "On submit" have the option to begin a flow?

Shouldn't there be an option for "On submit" have the option to begin a flow?
I haven't used it yet but believe at the moment you can only call the Power Pages flows by the Portals Web API as per the example https://learn.microsoft.com/en-us/power-pages/configure/power-automate-how-to
Generally, Form submissions will result in an Update or Create/Insert in Datavsere and for these you can already use Flows whose trigger node is Dataverse (add, modify etc). Workflows or plugins.