https://developer.wordpress.org/reference/functions/get_the_archive_title/

<?php if( strpos( get_the_archive_title(), 'banana' ) !== false ) echo 'cool fruit'; ?>

you will need to add formatting etc to the code dependant on the structure of your theme and where you want to output the text;
you might need to edit tag.php, or archive.php or index.php of your theme /child theme;
should work in all archive pages…