Comment module from linked record

I’ve added a comment module to a record page for my “Costs” collection. There is a linked record “selection” with this record but I cannot access the comments for that linked record. However, there are a handful of linked record options to choose from. How to I get my preferred linked record to appear in this list of options. Its seems very random what linked records you can get the comments from.

Hi Ryan, we only show single-linked records in this list

I.e. if an Employee had a Manager, the manager would show up here.

But the managers ‘Reportees’ would not show up, because there are multiple employees which report to the same manager and thus there’s no single record to check for comments against