Use Yoast SEO Title and Description in Schema Output https://schema.press/docs/yoast-seo-title-description/

schema-yoast-seo-headline-description.php

<?php //* do not include php tag

add_filter( 'schema_output', 'schema_wp_override_description_yoast_seo_5636346455' );
add_filter( 'schema_about_page_output', 'schema_wp_override_description_yoast_seo_5636346455' );
add_filter( 'schema_contact_page_output', 'schema_wp_override_description_yoast_seo_5636346455' );
/*
*	Pull Schema Title and Description values from Yoast SEO 
*/
function schema_wp_override_description_yoast_seo_5636346455( $schema_output ) {
	
  // get Title (Headline) value from Yoast SEO post meta
	$headline = get_post_meta( get_the_ID(), '_yoast_wpseo_title', true);
	
	// get Description value from Yoast SEO post meta
	$desc = get_post_meta( get_the_ID(), '_yoast_wpseo_metadesc', true);
	
	// override the values in schema output
	$schema_output["headline"]    = $headline;
	$schema_output["description"] = $desc;
	
	// return our schema array
	return $schema_output;
}