Average process progress within sub processes

[Tech_Service]

I’m creating a data that will average all sub processes within it and return to be total average process progress for my project. I design the data that is a data loop but should not happened to be an infinite data loop. The designed is as shown in the diagram

it is deffinitely a loop but it is not infinite. But it seems this is not allowed in Appsheet. is there a work around on this?