@Pepperoncini good answer! That means you have some options. If you have a PC already but don't like sitting at your desk you could get some use out of a Steam Deck since you can play games anywhere on it, stream games from your PC, plug it into your TV (and stream games to that, without moving your PC), it supports loads of input devices but has a powerful set of controls and a control editor of its own, it's a really flexible device. You can also install emulators on it very easily but that's all I'll say about that. I love mine, haven't played a game on anything else since I got it in 2022 (but I'm not much into AAA games myself, or online shooters) and would recommend it to anyone who wants to get away from their desk.
Failing that, you could get a Raspberry Pi and install some sort of game streaming software (Steam Link, Moonlight, etc.) on it and leave it plugged into your TV, again so you can leave your PC where it is. You could get a controller for your phone, even, like a Backbone or whatever, stream your PC to that... Finally, Valve are releasing a mini-PC that's supposedly better than 60% of existing Steam users' PCs (obviously the bottom 60%), a controller that's basically a Deck's worth of inputs and a VR headset next year which might be of interest depending on how good your PC is.
One thing I would say though is while you can get keyboards for use on your sofa/couch/settee/whatever, they're subpar. I have a Roccat Sova and used to play a lot of Insurgency with it but it's a bad way to play keyboard and mouse games AND a bad way to play games on your TV, they're just fundamentally incompatible in my opinion, so I don't think you'll get a vastly different experience PC gaming on your TV. It's more about having the same library of games available everywhere instead of one on your PC and one on your console.
Don't fall for the PC elitists that tell you you can only hook a PC up to a monitor and have to sit behind a desk with a wired mouse/keyboard/network, that's just BS. 
