As far as I know this is still not directly possible. If your main goal is to look at the generated tir have a look at my previous answer to: TVM terms: relay, topi, tir, te - #6 by jack-willturner
If you really need to implement something like a relay.lower you could probably return the TIR modules here: https://github.com/apache/tvm/blob/b5f1dabce45e4d4a68a2ecadeee811bac93b1c3c/python/tvm/relay/build_module.py#L479