Hi @Matt Doar _Adaptavist_ - thank you for the feedback. I have shared your post with the wider team who worked on this feature.
As a FYI, the formatting applied will be out of the box and it depends on the language set in the users Atlassian account as well as the currency format applied. If you select USD and your language is set to English (US), a comma will be used for the thousand separator and decimal for the decimal separator, but this will be reversed for those viewing USD in some European languages for example.
Hope this helps
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