Tons of retail options exist already for what you want to accomplish...
https://www.amazon.com/Baoblaze-Garage-Parking-Sensor-Assist/dp/B07BVK5FY8
https://www.lowes.com/pd/STRIKER-Universal-Garage-Door-Parking-Assist/50426818
https://www.homedepot.com/p/STRIKER-Ultra-Sonic-Garage-Parking-Sensor-00246/206130073
https://www.amazon.com/Nordstrand-Parking-Assistant-Garage-Indicator/dp/B07CJLZTK3
https://www.amazon.com/Baoblaze-Garage-Parking-Sensor-Assist/dp/B07BVK5FY8/
https://www.amazon.com/Nordstrand-Parking-Assistant-Garage-Indicator/dp/B07CJLZTK3
As such, I'd be inclined to spend $20 on one and transplant the 'guts' into your application. Switch your halogen sockets to small LEDs and w/ some simple wiring / soldering (or even crimp connectors) the mission should be accomplished.
That said, 'compliance training' with Party W in household is explicitly not included in any kit. So you're on your own entirely there... (said one with tongue firmly planted in cheek whose better half just backed her Macan S into his track car hauling trailer at way end of driveway yesterday AM despite three mirrors, 8" back-up camera screen and those 'annoying' beeping sensors she wishes could just be turned off
)
Good luck
