If I am not worng it is not possible. Maybe the community members will correct me.
PG level metrics numbers are limited. (you can check it in your env. at metrics by the dimension filter)
Most of the metrics can be splitted and can be vizualized by process group instances (individual member of a PG).
I hope it helps.
There was never a dashboard tile for a process group as the important metrics differ between technologies. With Data Explorer you can create your own tile and display the metrics you consider important.