Hello, generally speaking, in order for a transmitter to be possible to used for the simulator it either needs to have a USB port that can function as a USB joystick, or a 3.5mm trainer port.
(There is one more possibility, and that is if you can find a USB simulator dongle that has a built in RC receiver using the same protocol as your transmitter, or one that can be connected via a regular RC receiver (might quickly get complicated)).
1) no port no luck, 2) could at least in theory be used via a futaba compatible receiver and USB dongle combo, but it would take some hacking skills. 3) the Xiaomi 4K remote control can not be used as a joystick as far as I know (contact Xiaomi if you want to know for sure).
My best advice, if you are willing to invest a bit into the hobby, is to get a multi protocol transmitter such as the Jumper radios, or similar. Make sure you get one that can be used as a USB joystick.
If you just want to give the sim a quick try you can try to find a Playstation, Xbox, bluetooth gamepad or other similar gamepad that you might have laying around.