I tried calculating how many Hydralisks I would need for an attack.
It doesn't matter if you add a Lurker or not, if you use the "Attacker" box, Hydralisks won't appear in the "Simulator Battle Report".
You could swap the Attacker and Defender positions to get a feeling for how many Hydralisks you would need against the enemy fleet,
but you can't include enemy stationary defences since they obviously can't attack you :)