How to change font weight in Adw.EntryRow using Pango.AttrList?

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I have an EntryRow and I need to change its entry text style. The only way I know how to do this is using Pango.AttrList, but I don’t know how to create one with needed parameter.

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Refer:

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So what text argument should I use in AttrList.from_string() for making text bold.

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