$this->post_types = array ( 'post', 'location' );

foreach( array( 'field_1', 'field_2' ) as $field ) {
        register_rest_field( $this->post_types,
            $field,
            array(
                'get_callback'    => array( $this, 'get_post_meta' ),
                'update_callback' => array( $this, 'update_post_meta' ),
                'schema'          => null,
            )
        );
    }

public function get_post_meta($object, $field_name, $request) {
    return get_post_meta( $object['id'], $field_name, true );
}

public function update_post_meta($value, $object, $field_name) {
    return update_post_meta( $object->ID, $field_name, $value );
}

response = await this.wordPress.cv_location().create({
      title: article.title,
      content: article.content,
      status: article.status,
      meta: {
        field_1: article.field_1,
        field_2: article.field_2,
      }
    });