Dear all,
I would like to add automatically a person to "Request participants" when a new request is created.
I tried to use the automation function by creating a rule: WHEN Issue created THEN Edit issue. This doesn't work since the possible field options for "Edit Issue" do not include "Request participants". So that I could select "Request participants" instead of "Assignee" as this screenshot shows.

I would like to know how I can either add "Request participants" as an option for "Edit Issue" or if there is another way to achieve my goal? The other related questions I have found here, couldn't help me further.
Thank you!