Thanks for reaching out to the Community! This is a great question 🙂
You can use association labels as triggers in a workflow (with the exception of contract-based workflow), however, association labels currently cannot be set, removed, or send internal notifications through a workflow.
I would encourage you to upvote this related feature request in the Ideas Forum that is currently being reviewed by our product team. If you would like to receive updates on the idea, I would recommend commenting in the Idea Thread so you are automatically subscribed to updates made to the idea by our product team. Thank you!
Best,
Kristen
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