TRRS is what the iPad uses for mic input and stereo output like in the typical corded apple earplugs (with a mic). The other end of the cable that goes to your mic is most likely a regular TRS. If you use a regular 3.5mm TRS on both ends, the audio will not be routed to the input of the iPad.
But yeah, a camera connector kit or a cheap audio interface will be a better and more robust solution.
I’ve been playing Kingdom Come: Deliverance (2018) for the past month or so. Haven’t been this immersed in a game world in a long time. Sure it’s a bit janky at parts and gets a while getting used to, but the world is beautiful and the attention to history and realism is incredible!