Does the existing slab have any footing to support the additional weight of the block and new concrete?
If so I'd drill into the existing slab and epoxy rebar into the holes . Lay the block in a running bond with dura wall in between each course , ( it looks like a wire ladder) . Back fill the cavities with concrete . Let it cure, back fill the "ring" chainwall and form whatever decorative edge you may want on the slab , pour the concrete as normal
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