Apart from the fact that (pending further info) nothing much should be different in 1.9.1 compared to 1.9 …
I’m only aware of an “Always ask” in this context in case there are 2 SIM cards in the phone. In case of only 1 SIM card I’m not aware of an “Always ask” … but if this should exist, I’ll happily learn.
You could simply turn Mobile data on and off in the Quick Settings (see here how to get the separate toggle back in /e/OS Android 12), or perhaps the data warning and data limit settings can do something for you?