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I can help.
A 4" slab can't support much weight with a post at the corner. Especially with bending forces
You will need to cut away a portion of the slab, pour the footing and kneewall, then pour back the slab
Sorry I don't have better news for you. I think there is a way to do this to minimize the cost and possibly even not remove any of the existing slab on grade.
Wow! Not sure where that came from. I'll gladly request a refund for you. Good luck with your project. Take Care.