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hugo7
If I were in this situation I'd try to lift that back edge and replace the bearer. Lift some floorboards inside the shed to access the slab and then make up one or more of these:
https://youtu.be/2UFFx7Sslzs
(You don't need a 1st fix nailer a hammer will do)
Bracing them off strong points in the roof to lift the wall just enough to slide the old bearer out and out a new one in. 10mm should do it but you may need to cut nails or screws; a multi tool would be useful if you have to do so.