Variable to get Term Slug in Category SEO Setting

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for the delay.

You can use this filter on your theme’s functions.php file to register a %category_slug% variable

add_action( 'rank_math/vars/register_extra_replacements', function(){
	rank_math_register_var_replacement(
	   'category_slug',
	   [
	   'name'        => esc_html__( 'Category Slug', 'rank-math' ),
	   'description' => esc_html__( 'return category slug', 'rank-math' ),
	   'variable'    => 'category_slug',
	   'example'     => category_slug_callback(),
	   ],
	   'category_slug_callback'
   );
});
function category_slug_callback(){
	$tag_ID = $_GET["tag_ID"];
	$catinfo = get_term($tag_ID);
	$categoryslug = $catinfo->slug;
	return $categoryslug;
}

You can search Category slug in the drop-down list, or you can use the %category_slug% variable directly.

I hope that helps. Thank you, and looking forward to your update.