Not really because you just need to mimic the exact same force vs travel a load cell has with a multi-rate spring that gives the same force, and has the same travel. Then you can adjust the brake curve (gamma) and sensitivity in a game so the pedal feels similar in every game.
The force and travel can be exactly the same as the load cell, or any braking system in real life. You just need the actual data from that load cell brake pedal or real brake pedal, so you can clone it.
I'm sure you don't need a load cell to have realistic brake feel, it's a myth.
Imagine if your real car suddenly had no mechanical link to the brakes at all. Imagine engineers measured the exact force and travel the mechanical brake pedal had, then cloned it exactly with a multi-rate spring and pot. There would be no force or travel difference. The difference would be that you wouldn't be able to detect a near lock up, ABS engagement, fade etc as there's no link to the brake fluid anymore.