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I'm fairly certain it isn't, at least in the core engine. The dev team works really hard to make sure every feature going into core is:
Things like eye tracking are more likely to be done in add-ons, GDExtension, and the like. You'd have better luck looking for an addon or C++ library that could get integrated
I was talking to some people from a company that makes an eye-tracking thing and apparently it's really hard to do with precision, so it's unlikely that any hardware you're willing to pay for is going to do what you want.