Add comment field to tasks (+ option to tagg members and upload screenshots there)

Would love to have a comment field in every task, so we are able to document when we are for example waiting for some client’s input and that’s why we can’t start the editing task yet.
If this comment field would allow to mention teammembers, so they get notified whenever it’s something referring to them and also upload screenshots in this comment fields, that would be a huge step for us! Atm we are not using the task manager atm because of that but Notion instead.