woocommerce/api/rest-api-filters/hook.php

<?php

$filters = get_option( WCA_Test_Helper_Rest_Api_Filters::WC_ADMIN_TEST_HELPER_REST_API_FILTER_OPTION );

function array_dot_set( &$array, $key, $value ) {
    if ( is_null( $key ) ) {
        return $array = $value;
    }

    $keys = explode( '.', $key );

    while ( count( $keys ) > 1 ) {
        $key = array_shift( $keys );
        if (! isset( $array[$key] ) || ! is_array( $array[$key]) ) {
            $array[$key] = [];
        }
        $array = &$array[$key];
    }

    $array[ array_shift($keys) ] = $value;
    return $array;
}

add_filter(
    'rest_request_after_callbacks',
    function( $response, array $handler, \WP_REST_Request $request ) use ( $filters ) {
		if ( ! $response instanceof  \WP_REST_Response ) {
			return $response;
		}
	    $route = $request->get_route();
		$filters = array_filter( $filters, function( $filter ) use ( $request, $route ) {
			if ( $filter['enabled'] && $filter['endpoint'] == $route ) {
				return true;
			}
			return false;
		});

	    $data = $response->get_data();

		foreach ( $filters as $filter ) {
			array_dot_set( $data, $filter['dot_notation'], $filter['replacement'] );
		}

	    $response->set_data( $data );

	    return $response;
    },
    10,
    3
);