Can you just put thumbnail images - like jpg - on video track or other way?

When using other than Cubase video engine, external synced or through VST plugins etc - one might still want thumbnail at markers you make for each scene.

Can you just import single images, or clear out and edit just use some thumbnails and then remove video as such?
Just having images on various spots for timeline at markers.

Not a biggy, but still cool if possible.

Thanks for any ideas on the matter…