Simple addition, I think it’s quite a popular neutral font that makes sense. Cheers!
Hi there, @An_Duc_Le 
Thank you for the idea!
I see you’ve already found a CSS code for the custom font and applied it to your widget. However, I get you point that it would be awesome to have this font right in the settings.
We’ll try to think about it in the future, especially if more users upvote this request 