Hello,
I find the answer. You don’t need ACF for that.
You can import these values by:
1) Importing the values as shown here:

2) Adding the following code snippet to the function editor.
function my_custom_field($value, $post_id, $key, $existing_meta_keys, $import_id) {
if ($key == "wc_productdata_options") {
$value = array($value);
}
return $value;
}
add_filter('pmxi_custom_field', 'my_custom_field', 10, 5);
That should do it.