I want to create a Case using Process Builder and the owner of the Case should be a specific queue. However, I don't want to hard-code the Queue ID in the Process, I consider that bad practice. The Case is created when some Opportunity is altered, so I could use an Opportunity formula field to get to the Queue ID. I use that technique to give the Case its proper name, viz. the concatenation of some Opportunity fields. As far as I know, it is not possible to create a lookup to a queue. Also, the Opportunity is not owned by the queue, nor by a member of the queue.
So I guess my question turns out to be: how do I get a Queue ID, in a formula, given just the name of the Queue?