Allow Sub Items on Doc types

Description

Allow subitems to be featured in docs using the { feature. I’m trying to develop a report and pull outcomes, outputs, and activities into a doc using automations/{ features and I can use subitems - which makes it very hard to view the board.
Additionally, make it so those items can use mirror and formula columns as well!

What are you trying to achieve

create a funder report pulling information from boards into a doc