I’m currently grouping cards together and then using the link in order to embed a view of them into documentation on Clickup. When I do so, I lose the nice titles I have set up per each card. Here are some screenshots to show you what I mean.
No, this isn’t possible, and I wouldn’t advice grouping top-level frames for multiple reasons, not only titles (e.g. you won’t be able to view them in the prototype). You can try to create a rectangle as the background for these frames and then embed it. But I’m not sure if it will show the frames on top.