By importing source material into the Asset Browser, you can use the catalog and tag functions to organize it, and then drag it into the VSE.
To get it working, you'll need use Blender 3.4+ beta and to go to Preferences > Interface > Developer Extras and enable it. And then enable Preferences > Experimental > Extented Asset Browser.
You'll find the function exposed in the Sequencer > Menus > Add > Import as Asset.