Go to the workflow, create a draft copy of it (you can't amend an active workflow), find the transition you want to set the assignee on, open that and look for the post-functions. You should see an "add" link, which will ask you for the post-function type - look for "set field", and then it'll ask you for parameters for the value to set.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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