wro_addons.xml and classpath in SAP Commerce Cloud

Hi,

I have a wro.xml file which includes the wro_addons.xml with this directive:

<import>classpath:wro_addons.xml</import>

I have <group> defined in the wro_addons.xml for js files which works well locally. However it does not work when deploying to SAP Cloud. An HTTP 404 is returned as if WRO was not able to import the wro_addons.xml via classpath. What am I missing? Using sap commerce 2105