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I guess there's also a wider question as to why this has occurred?
If you were asking questions you could also ask why there's a 70mm drop in floor level ('level') from one end of the studio to the other. My answer would be that the previous owner's threshold for 'good enough' is considerably lower than mine.
6pt
Different use case but I used this stuff to patch a porch overhang: https://www.toupret.co.uk/professional-filler/product/exterior-surfaces/masonry-repair-filler
No max depth. So I don't think you'd need expanding foam. Just pack it in.
I guess there's also a wider question as to why this has occurred?