Linking to the page you’re currently on isn’t typically recommended, but it’s possible with a child theme.
You’d need to copy the current content-single.php file from the parent theme into your child theme.
Then replace this:
if ( generate_show_title() ) {
the_title( '<h1 class="entry-title" itemprop="headline">', '</h1>' );
}
With this:
if ( generate_show_title() ) {
the_title( sprintf( '<h1 class="entry-title" itemprop="headline"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h1>' );
}