is it possible to reserve the answers to a group?
please next time describe a bit more, what you mean. I can currently only guess.
What is not possible yet, is to share the responses to a group.
But if you want to restrict form-submission to a group, you can do that in the sharing options on the sidebar, which you find behind the button in the top right corner.
I look forward to the answer being subject to a group or a person
for example: during a registration form whose publication is public, the response must reach the group or the person responsible for registering it, without the form being made by this group or this person.