Is there any way to change the format of the numbering in the tasks outline? (OmniPlan 3.14.2 for Mac)

the default hierarchical numbering format for outlines looks like this for a parent task: 1), like this for a child task: 1.1), like this for a grandchild task: 1.1.1), like this for a great grandchild task:, etc.

Is there a way to change this format to something like:
Parent task: 1.
Child task: A.
Grandchild task: i. or something similar? Or is there no way to change this format?