Well, I believe we can assume that the creator of an issue is the current user of JIRA, so you can add a postfunction in your Create Issue transition to set the assigne of the issue as the current user. You can find more details about workflow postfunctions in the link below:
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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