Get Post URL by meta value, function that returns a post URL that match the given meta value.

jet-engine-get-post-url-by-meta-value-callback.php

<?php
	add_filter( 'jet-engine/listings/allowed-callbacks', '__your_prefix_get_post_url_by_post_meta_callback', 10, 2 );

	function __your_prefix_get_post_url_by_post_meta_callback( $callbacks ) {
		$callbacks['__your_prefix_post_meta_field_value'] = esc_html__( 'Post URL by Post Meta Value', 'jet-engine' );
		return $callbacks;
	}

	function __your_prefix_post_meta_field_value( $meta_value ) {
		global $wpdb;

		$ids = $wpdb->get_col( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE meta_value = %s", $meta_value ) );

		if( count( $ids ) > 1 ) {
			return false;
		} else {
			return get_permalink( $ids[0] );
		}
	}