[Merging one layer with several others.]

Thank you!

[Merging one layer with several others.]

Hi there.

 

I'm trying to edit a gif that has over 100 frames. I would like to add text over the entire gif but I can't figure out a way to have that layer merge with all the others and always stay "on top" except adding it one by one which would be exhausting. I can't Ctrl+Shift+F as it will not work. Is there any way to do it?