How to add citation schema

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

Rank Math makes it possible for you to take a control of your SEO and you can easily extend the Rank Math JSON-LD output by making use of the following filter:

/**
 * Collect data to output in JSON-LD.
 *
 * @param array  $unsigned An array of data to output in json-ld.
 * @param JsonLD $unsigned JsonLD instance.
 */
add_filter( 'rank_math/json_ld', function( $data, $jsonld ) {
	return [];
}, 10, 2);

Here’s how you can add filters/hooks to your WordPress site:
https://rankmath.com/kb/wordpress-hooks-actions-filters/

Let us know how it goes. Looking forward to helping you.

Thank you.