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There's some work on this already, including Holophrasm and work by OpenAI on proof shortening. These efforts are linked from the Metamath wiki:

very cool, thanks for sharing

OpenAI has managed to derive a number of Metamath proofs, some of which are smaller than the human-created proofs, using machine learning.

Here is a gource visualization of metamath proofs overtime in the set.mm database: https://m.youtube.com/watch?v=LVGSeDjWzUo

Note that near the end, one of the contributors is OpenAI, who is not a human contributor.