Adobe Portfolio rel="me" stripped out

I think I know the answer already, but just in case there's a way I haven't thought of, is it possible anywhere in Portfolio to add an html link with rel="me" as an attribute? e.g:

<a href="XXX" rel="me">Mastodon</a>

The social blogging service, Mastodon can use rel="me" to verify that the website and account are linked, but unfortunately adding this code to the footer strips out the rel="me" tag.  I can't see another option, which is a shame.