There is no op-mode python wrapper script (along with the cli tag-node/bash completion stuff) for mtr, which is the pathway to enabling VRF functionality. Proposing to add it :)
'vrf': { 'traceroute': 'sudo ip vrf exec {value} {command}', 'type': '<vrf>', 'help': 'Use specified VRF table', 'helpfunction': vrf_list, 'dflt': 'default'}
I'll get a pull-request together...