Jira pack and text formatting


I am trying to create new issues on Jira with the Jira pack.
I wanted my issues to have a bit of formatting, simple bold and italic would be enough here.

I have tried a lot but nothing seems to work.
I have a template and use Format(TemplateName.template, myVars).

In my template I tried toBeBolded, toBeBolded, toBeBolded

But nothing seems to work. Do you have any clue on this ?