You mean in addition to the room mics? Yeah, it’s just the style. Some kit designers go nuts with the ambient and room mics. Others are very minimal. There was even a Drum Drops kit that had no direct mics at all, which was super weird.
If I’m not using a preset, then a lot of time I tend to go more minimal on the ambient mics. It’s usually just some OH’s and one of the Rooms.
One thing you can do is put a send from either your directs or one of the ambient channels to Aux1, and then put a reverb plugin on it. You can use one of the built-ins, or if you have a nice one in your DAW, do a totally separate output. If you want something closer to your typical Amb3 mic that doesn’t sound like a huge echo chamber or whatever, get the room size and reverb time down.