You may want to have a look into the Nextcloud Polls-app (https://github.com/nextcloud/polls). A full-featured forms-app is not available at the moment, and is not in development.
Maybe you know somebody - or you want to develop this app yourself
I noted that it only allows binary (Yes/No) type of responses.
The only feature I am missing is that cannot responders add own text, answer open questions or multiple choices: