Is it possible to use 1 uart

[ShohninDmitriy]

Is it possible to use 1 uart and switch driver chips using addressing individual pins

[teemuatlut]

Possible: quite likely. Supported by the library itself: no.

You could however define each driver instance to have the same serial port or sw serial pins and then just toggle correct the addressing pin before trying to communicate with a driver.

[ShohninDmitriy]

and how to implement it for example in marlin or klipper