Hi @OZarp,
yes - it’s possible. From a ux point I wouldn’t recommend it since this is a quite old technique but if you want - add it.
Basically you need some kind of jQuery/Javascript for this which will be placed in your base.html/layout.html which will be executed everytime somebody opens the page.
There are a ton of ready-to-use loaders out there in the wild. So again - find the one you’d like to add, place the script in your base/layout html file, apply some CSS if needed and done
best,
Anton