Hi @Arturas Rimkus,
Actually you can do it by adding the following in the announcement banner. This script changes the font, set it as bold and italic. You can change it as you like.
document.getElementById("summary-val").style.fontFamily = "'Times New Roman', Times, serif";
document.getElementById("summary-val").style.fontWeight = "900";
document.getElementById("summary-val").style.fontStyle = "italic";
That trick is only going to format the summary in places where it is exposed in a style tagged as the summary-val - it'll happen in some places but not all of them (because it's wrapped in different tags in some places) and it's not formatting part of the summary, it's the whole string.
1) No, you don't have to put anything in the banner that is visible to the user. The banner in JIRA is always there, but when it's empty, there's nothing for the browser to do, so nothing really appears. If you put a script in it, then it'll run the script, not display it (assuming the tags are right, so the browser knows to run it. You should be able to literally paste in Georges' script as it's spot on)
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