jet-egine-customize-admin-filter-labels.php

<?php
/**
 * Given example can be used to format timestamp into human-readable date, but the same logic can be used for any modifications
 */
add_filter( 'jet-engine/admin-filters/filter-label', function( $label, $filter ) {
	if ( 'meta' === $filter['type'] && '__date' === $filter['meta_key'] ) {
		$label = date_i18n( get_option( 'date_format' ), $label );
	}
	return $label;
}, 10, 2 );