This exists on Android. If you enable the "developer settings"

https://www.howtogeek.com/129728/how-to-access-the-developer...

you then have the option to enable "Aggressive Wi-Fi to Cellular handover"

> It just artificially reduces the WiFi RSSI (received signal strength indication) to encourage the WiFi state machine to decide to switch the connection from WiFi to cellular network.

https://android.stackexchange.com/questions/90250/what-does-...

Anecdotally, I have had fewer headaches with the phone holding on to poor wifi-signals since I enabled this. Ideally the phone would handle this in a smarter way, e.g., by monitoring the strength of both the wifi and data signals and switching to whichever is likely to have the least packet loss.