Is Value Array allows you to map an array of values from your data source. This setting tells the WP Data Sync API to process the values as an array.
Example Value as Array
The Source Key is
Images and the value of
Images is an array.
array( Images => array( 0 => 'https://website.com/image-1.jpg', 1 => 'https://website.com/image-2.jpg', 2 => 'https://website.com/image-3.jpg' ) );
Configuring Value as Array
Configuring Value as Array with a Child Key
Visit Child Key for a complete example.