For Microsoft 365 Forms there is an undocumented api available at https://forms.office.com/formapi
Obviously it would be great to make this api official and document it, but even more awesome would be to bring it into the Graph API.
The reason for me would be to get to the form using the API, render it with my own logic and UX and submit the results of the form using the API again. This would enable me to incorporate Microsoft Forms into the UX of my customers.
I'm pretty sure many developers may come with additional use cases for this API