Field Render choice not working

[Bud Herz]

Hey Jira Community,

I have a custom multiline text field that I have enabled the Wiki Renderer for. I've gone back to the workflow to test it out and the field still renders as simple text. Any help would be appreciated.

No *bold* No _Italics_ No +Underline+

...and so and so on. 

It would be ideal if we could just clone the Description and rename it, but nope. Jira has to go and be all crazy with this set up. I've been studying the pages about Renderers like here - https://support.atlassian.com/jira-cloud-administration/docs/configure-renderers/

And here - https://support.atlassian.com/jira-cloud-administration/docs/specify-field-behavior/

Also I have found this older related topic, but it's not clear if it was solved there either - 
https://community.atlassian.com/t5/Jira-questions/Fields-Not-Using-Wiki-Renderer/qaq-p/580321

[EDITED] -- Per this thread it appears I cannot do this because I am on a Jira Cloud instance(?) - https://community.atlassian.com/t5/Jira-questions/Marked-a-custom-field-color-or-bold/qaq-p/892187 

That sucks.