I recently had exactly the same problem with Shelly EM and integrated in Home Assistant through HACS (Shelly for HAAS (Shelly Integration)).
After much searching I eventually found the answer. The ShellyForHASS integration defaults to only providing: current_consumption & total_consumption.
To get more sensors - need to configure it e.g. in configuration.yaml add the following:
See docs for the parameter "sensors" here: https://github.com/StyraHem/ShellyForHASS