The scent lasts much longer than the chlorine, so it will build up if you keep using it and if you decide you don't want it anymore you will be out of luck. Your pool won't be the only thing smelling lemony fresh either, everyone who swims will as well and it may not just shower off.
Also, you don't know what is in it. The general rule is if you don't know what is in it then don't add it. That all said, you probably won't actually hurt anything by adding it, but if anything goes wrong everyone is going to point to your use of scented bleach as a possible cause.