JQL condition on sub-tasks for "Affected Service" in Jira Automation

[Charlie Misonne]

I have an automation rule looping over every value in the Affected Services field.

Later in that branch I need to check if the triggerissue has any sub-tasks with the current value from the iteration for Affected Services

If it does nothing happens, if it doesn't a sub-task is created.

I thought this simple JQL condition should work but it doesn't.

The JQL always returns 0 results and I assume it translates as: "Affected services" = Confluence.
(Let's say Confluence is one of the services selected in the parent)
While JQL expects a value like "b:xxxxxxxxxxxxxxxxxxxx=" which is a base64 string for ari:cloud:graph::service/<ID goes here>

Is what I'm trying to achieve supported?