Dude Chart

Hi guys,
I have an CCR1036-12G with routeros 6.37 used as main router and as Dude server

I would create some chart showing interfaces of the device with both tx and rx, but when I go to chart settings and try to add element I didn’t see CCR1036 interfaces (the router is listed inside devices) but only some of other monitored devices interfaces

Can someone point me to some documentation or trick to accomplish this task?

Thank you