It seems that is not the same as counting the two-bar phrases, as in Fred’s reply below.
How did you achieve that please?
I did find one source that numbered the 2-bar repeats, Kurt Stone’s “Music Notation in the Twentieth Century.”
This seems … not possible to do in Dorico, because as soon as I remove the 2 glyph, the erase background feature for it wipes out some of the music. I tried vertical positioning, a non-breaking space, Alpha 0, and other tricks but I can’t seem to work it out. It seems like this should be possible so maybe someone else can find a way to remove the 2.
Honestly, removing the 2 seems dangerous too as players are accustomed to seeing it there, so I’m not sure what the best standard for this should be. The workarounds above used numbered bar regions with the number set in Properties for the top one, then just text for the bottom. Maybe the bottom solution with the repeat count number under the staff would be a better looking option.
In any case, this is not something that Dorico is going to automatically do for you so you’ll have to find a way to get the look that you want to achieve.