Can't mirrored columns be used in automatization with sub-items?

I’m creating a setup for two boards to co-operate. One board is for game level creators, the other is for the QA to report issues found in the level.

In the GMC board, there’s a person assigned to each “Story” level task. The column is mirrored in QA to showcase who is responsible for this particular issue.

At the moment, we have “Story” be auto assigned to “CA (Cinematic Artists)”, but that means several people unrelated to the task is constantly getting spammed with messages not pertaining to them.

We need an automation that assigns the person displayed in the mirrored column as the “Assigned to” when “Issue Type” is set to “Story”.

Is this not possible due to the column being a mirror?