add as you would any custom field:
Select the standard text field (multi-line is my usual choice)
Once the field is setup, go to the field configuration and choose 'wiki-style renderer'
I think that's what you are asking for...
Hey admins! I’m Dave, Principal Product Manager here at Atlassian working on our cloud platform and security products. Cloud security is a moving target. As you adopt more products, employees consta...
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