I also +1 this feature.
It seems that what you want to do is very similar to a previous post I had Relay pattern replacing with custom relay ops?
The biggest fear I have of introducing a new Relay operator (which I guess is what would eventually happen if we follow this path) was that it would have to work with all the Relay transformation passes. The example in the TVM documentation https://tvm.apache.org/docs/dev/relay_add_op.html seems to trivial and not sufficient to answer this question.
Any guidance you could give would be gladly received 