Automation: cascade confluence link to subissues

[Marcin Olszewski]

Dear Community,

I'd like to ask for your guidance.

Long story short: user wants to create an epic, then create some tasks aligned to this epic. Later, when he adds a Confluence page link to the epic, he wants the same link to appear for all related tasks.
I tried to search the Automation tool, but I couldn't find "Link Confluence page" anywhere in the triggering fields (I found only "issue linked", but it seems to be for other issues only, not the confluence). However, I'm quite new to the tool and I could've easily missed something.
Please let me know if it's possible and, if it is, how should I proceed.

Thank you in advance.