Changing time signature groupings

I’m not able to find how to change the grouping of my alla breve time signature. I want all the eighth notes to be divided into groups of 2 - so basically 1+1+1+1/4. But I still want it to be alla breve.

This might be a good use case for this workaround: A workaround for persuading Dorico 3.5 to beam/group 2/2 like 4/4