ACF Query for Posts with Specific Relational Field

gistfile1.txt

<?php

    /*
		*  Query posts for a relationship value.
		*  This method uses the meta_query LIKE to match the string "123" to the database value a:1:{i:0;s:3:"123";} (serialized array)
		*/
		
		$args = array(
		    'post_type'      => 'doctor',
		    'posts_per_page' => 10,
		    'meta_query' => array(
				array(
					'key' => 'locations_serviced', // name of relational field
					'value' => '253347', // matches exaclty "123", not just 123. This prevents a match for "12345". This is the ID of the Related Post.
					'compare' => 'LIKE'
				)
			)
		);
		$loop = new WP_Query($args);
		while ( $loop->have_posts() ) {
		    $loop->the_post();
		    ?>
		    <div class="entry-content">
		        <?php the_title(); ?>
		        <?php the_content(); ?>
		    </div>
		    <?php
		}

You can put this code on a page template or throw into a function and call the function on your page template. Or call via a shortcode:

function denver_docs_shortcode($atts) {
	
	$atts = doctor_query_denver();
 	return $atts;
}

add_shortcode( 'denverdocs', 'denver_docs_shortcode' );

Then add [denverdocs] to your page or post you want the results to show on, though I am getting a Gutenberg JSON notice when I use this shortcode.