Use the woocommerce_bookings_export_query_args filter to adjust the query arguments passed to WC_Booking_Data_Store::get_booking_ids_by(). This lets a customization narrow or expand the bookings included before the export rows are built. The snippet below limits the export to bookings assigned to one resource ID, which can be adapted for resource-specific reporting.
add_filter(
'woocommerce_bookings_export_query_args',
function ( array $args ): array {
// Only export bookings assigned to a specific resource.
$args['object_id'] = array( 42 );
$args['object_type'] = 'resource';
return $args;
}
);