Mj needs good drainage and airation in the root zone. Peat moss in itself doesn't offer this. Peat moss is an organic inert dried out moss that acts like a sponge.
I at one time operated a peatmoss picker. The peat fields are like driving over a giant sponge
The peat you purchase in a bail is already pre-ph'ed at the peat moss plant. Peat is often used to beef up soils that cannot hold moisture for extended periods of time where irrigation is limited..
The only thing that grows in natural peat is more peat, cranberries, etc, but only peat in the middle of the bog.
Adding dolomite lime to peat moss would take a while to react with the peat. When using purchased soils or spagnum it is already amended so whatever is done to further ammend the ph without counter balance would only put the medium out of balance.
Peat moss by itself, even properly ammended lacks the nessesary drainage to support healthy mj plants.
If I had to grow in moss I'd make/purchase the plantpots no more than 6" deep and expand the root zone area of the plant pot horizontally. By not having the plantpot(s) deeper would allow better airation for the rootzone. I would add a layer of gravel in the bottom of the plantpot before adding the peat for added drainage/airation of the root zone.