Mob farm idea I had

So I wanted to build a mob farm and I know if I afk I’ll eventually reach a cap on the monsters but I had a question If I were to have a system to transport all mobs into a specific nether portal while I afk it and then when I get back from afk go to a different nether portal go to the mob farm portal would it essentially take away the restrictions of a natural mob spawn limit have some insane amount of mobs in one area

Or would this just not work