I found this script on GitHub that works great!
Trello Bolded Card Titles Script
Use ** for bold, * for italics, and *** for bold and italics.
Hope this helps!
Thanks, Chelsea, "MarkDown" coding like you describes will work in the Card Descriptions. However, it is not active in *headers* like Card Titles or for Checklists. I believe these headers are preset formatted fields. So, it would be a Trello programming task to open these fields up to being formattable by Trello users. Yes, most of the MarkDown format coding will work - wherever it is allowed in Trello fields.
My big wish would be to allow for creating "multiple lines" in a Card Title box/field. This may be limited as is bolding text there. All suggestions are welcome.
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