Which text? Most of the text ScriptRunner will give you goes through the JIRA templates, so generally the answer will be "no, because it's not ScriptRunner formatting it".
There are some exceptions, where ScriptRunner will be able to use formatting - Mahesh has given you the main one - scripted field output, where your code should generate the raw html for output. But I'm not sure from your question if that's the area you want.
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