Updated on 22 Sep 2023
This Pro tutorial shows how the checked options of a Checkbox-type of Sub Field inside a ACF Repeater field can be output as an unordered list.
As of Bricks 1.9.1, it is not possible to do this without writing code.
ACF field group:

Repeater field being populated by editing a Page:

Result on the front end after implementing the tutorial:

Step 1
Install and activate ACF Pro.
Create your field group and populate the Repater field for entries of your post type.
Step 2
Edit your Page/template with Bricks.
Set up a query loop and select your ACF Repeater as the Type.
When done, your structure could look like this:

For outputting the checked values of your Checkbox-type sub field, use a Code element having:
<?php
// get the current row in the loop
$acf_row = BricksQuery::get_loop_object();
$cabinetMaterials = $acf_row['cabinet_materials'];
if ( isset( $cabinetMaterials ) ) {
echo '<ul>';
foreach ( $cabinetMaterials as $cabinetMaterial ) {
echo '<li>' . $cabinetMaterial . '</li>';
}
echo '</ul>';
}
?>
Replace cabinet_materials with the name of your sub field.
Turn on “Execute code” and “Render without wrapper”.
Step 3
Next, add a condition on the Section such that it gets output only if there is at least 1 row for the ACF Repeater.

{query_results_count:ugeseb}
where ugeseb is the Bricks ID of the element on which query loop is enabled.

Reference
https://brickslabs.com/accessing-acf-repeater-sub-fields-programmatically-in-bricks-query-loop/