Consider these points:
It contains a Workflow Post function and a Listener that you can configure to copy fields within an issue or between issues. It supports build-in fields and customfields of build-in types.
then get some html dev plugin for your browser to see what's going on (to get the id's mainly) and try something along those lines for the field description:
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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