sure, understood. As we are currently in a similar situation, we are considering using self-hosted n8n (rather than Zapier etc.) and hook the form submission code into that.
The way better option would obviously be to have the API, so… some research first.
→ What I am currently trying to find out is why it still doesn’t exist, why it has not been implemented from day one! Just an oversight? Or some nasty architectural challenges?