Where you are located calls for a 4" footer depth.
Here in Ohio it's 36".
I'd say your slabs are considered 'at grade' and have no footer.
A quick dig around the edge will tell you if a footer was done for it.
To be safe I'd saw cut the area you want the steps and pour a proper base.
Nothing is worse then having something like that crack the concrete and start shifting.
Saw cutting the 4" slab is quick and easy and the rent for the equipment is cheap.
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