The power line interface should behave as any other ethernet-like layer2 interface, so the example https://wiki.mikrotik.com/wiki/Manual:I ... ess_Ports) should work with pwr-line1 as the trunk and an ethernet interface as an access port.
Unless you really need all VLANs to be accessible over the power line network you could just change the switch port connected to powerline #1 to be VLAN 200 only.