Portable lifts are designed for that. A bolted lift probably isn't. Also, check your spec sheet for the lift, 5 inches of concrete sounds marginal.
I put an Ammco 12000 4 post in my shop, it called for 6 inches and specified no cut lines within a distance of each post. I asked the concrete guys to wait a couple days before doing cuts so I could mark the appropriate areas as no cut zones.
There were similar restrictions for my 2 post lifts with the biggest difference the distance to cuts. Much larger area for the posts.
Note, I was doing a commercial installation and things got used daily. For a hobbyist you might get away with less but things only have to go wrong once.
I recommend rethinking your lift purchase and getting a portable one
My two post 10,000lb BendPak says 4" of 3000psi concrete is the requirement, and that's with only two pads touching the ground (most likely less surface area). I did pour closer to 6" in the area of the lift just to be sure. No issues after 15 years. I was definitely surprise when I read 4"
