Yes, it is possible. Link to the fontawesome all.css stylesheet in the survey header. Then use fontawesome classes and data-* attributes in your html elements to display fontawesome icons.

Thank you TomG ... I think I found the survey header - in Look and Feel --> General --> Header (??)
I've added this to the header: https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.1/css/all.min.css" rel="stylesheet" />
and it seems to have worked.
Thank you so much.
Maria