Yes that is possible, no need to hack the loader app.
You can check out this page at the Shotgun support site:
Where they give this example on how to modify the loader:
An asset library tab which shows assets from a specific Shotgun project caption: Asset Library entity_type: Asset hierarchy: [sg_asset_type, code] filters: - [project, is, {type: Project, id: 123}]
Greetings
I am currently looking for this same solution on accessing a global “depot” via the loader but the above link doesn’t seem to be valid any longer.
Any information would be greatly appreciated
cheers~