Hi, I'm (getting crazy) finding a way to generate dynamic Fluent Tag based on a page meta field (The event name)

Context:

I created event pages with a registration form inside. When they register I need to apply a tag (Event name) into fluent crm, so I can separate those participants.

I saw that with fluent forms I can create dynamic logic, but It cannot actually choose a field from the form to retrieve the text and create/apply a tag.
So I should create all the Tags in advance and modify every time, it doesn't fix my need of using only one form.

I was wondering if I can do that with API but I have no Idea how to do it. Some suggestions?