One more example of custom callbacks for Filter field output in JetEngine / Dynamic Field widget.

jet-engine-more-custom-filter-callbacks.php

<?php

add_filter( 'jet-engine/listings/allowed-callbacks', 'jet_custom_callbacks' );

/**
 * Add callback to list.
 */
function jet_custom_callbacks( $callbacks ) {
	
	$callbacks['jet_team_name'] = __( 'Team Member Name', 'txt-domain' );
	$callbacks['jet_team_photo'] = __( 'Team Member Photo', 'txt-domain' );
  
	return $callbacks;
}

/**
 * Callback function for name.
 */
function jet_team_name( $id ) {
	return get_the_title( $id );
}

/**
 * Callback function for photo.
 */
function jet_team_photo( $id ) {
	return get_the_post_thumbnail( $id, 'thumbnail', array( 'alt' => get_the_title( $id ) ) );
}