Hey there…
Its not in-game, but have you tried Dammits Lootfilter export from his Build Planner… it creates a lootfilter based on your build - see Last Epoch Tools… So you could create your own ideal build and then export the lootfilter for it…
The idea of applying the lootfilter to the Stash & Inventory has been a very often requested feature… Not sure if the devs are entertaining it tho… 
I have 120 stash tabs and right now I chuck the items on the ground for the lootfilter to work, then I put them back in the stash based on the lootfilter sorting… tedious but it works for now…
Also… Have you looked at this - its very good for new players… and those trying to understand the loot filter system better…