** SOLVED **
With the help of some others of Facebook this solved.
You need to add the following to the Functions.php file in your child theme.
// This makes ACF Repeater fields work in a looper using the Custom type
// Custom Looper provider, use as “Hook”: my_acf_repeater
// and in the “Params” field, enter the name of your ACF repeater field like so:
// {“field”: “REPEATER_FIELD_NAME”}
// add a consumer with the setting {{dc:looper:field key=“SUB_FIELD_NAME”}}
add_filter( ‘cs_looper_custom_my_acf_repeater’, function( $result, $args ) {
return get_field( $args[‘field’] );
}, 10, 2);
Then, in the Custom Looper provider, use as “Hook”: my_acf_repeater
and in the “Params” field, enter the name of your ACF repeater field like so:
{
“field”: “REPEATER_FIELD_NAME”
}
This works flexibly for any repeater field.
In the Looper consumer, you can read the sub-fields inside your repeater like so:
{{dc:looper:field key=“SUB_FIELD_NAME”}}