no not an easy way
I use the get_avatar https://developer.www.ads-software.com/reference/functions/get_avatar/ and I don’t set the alt value in the call
May be I should add this but I guess that I will need to add it to shortcode as an option as not every one will what it and but would different values set
And a some filters would help
I need think about this for a bit
in the meantime there is a filter “aa_user_final_content” that has the $html, $user which you could use to add the alt the HTML
Paul