add_filter('frm_denylist_ips_data', function( $denylist_ips) {
	$denylist_ips['files'][] = 'path_to_custom_denylist_ip_file';
	return $denylist_ips;
});

add_filter('frm_denylist_ips_data', function( $denylist_ips) {
	$denylist_ips['custom'][] = '10.0.0.1';
	$denylist_ips['custom'][] = '8.8.8.8';
	$denylist_ips['custom'][] = '192.168.0.1';
	return $denylist_ips;
});