You should have a building permit for the bathroom in general.
The shower rough in should be a p trap. I’m assuming you have a 2” pipe sticking out the floor. There should be a p at the bottom. If not you have to bust the concrete anyway.
Bust the concrete out and run across to your shower drain. Remove that p trap and put one below the tub. It’s a couple hours extra work and no headaches. Rent a hilti and bash away. It’s really not that hard.
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