ACF has a built in filter for their flexible rows which you may be able to leverage/adjust for your own use on your repeater, or investigate and build your own:
apply_filters( 'acf/fields/flexible_content/layout_title', $title, $field, $layout, $i );
Their documentation covers this here:
https://www.advancedcustomfields.com/resources/acf-fields-flexible_content-layout_title/
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