I'm not sure this is possible at this stage; there are suggestions for both these things though:
It might be useful to keep your Release Managers in a multi-select custom field or a group, which can both be used in the "Send email" action.
would it be suitable to do it using "bulk mail" page? I know this is not Automation, however.
Sending to a specific role is possible, though.
For Role you could choose a different one - I only have the standard ones.
The page is reachable via:
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