Jamboard can be used to host group brainstorming sessions. In larger classes I break students into smaller groups and have each group work on a specific page within the Jamboard session. At the end of the session we review the ideas from each page and put the most popular ones on a final page. Here’s an overview of how to use Jamboard in Google Classroom.
https://www.freetech4teachers.com/2021/08/five-ideas-for-using-google-jamboard.html