[Python] Load openssl Ed25519 private key in PEM format into Python ed25519.SigningKey

I have some keys generated with openssl:

openssl genpkey -algorithm Ed25519 -out private_key.pem


and I would like to use them to generate ed25519 signatures in Python. I found the module ed25519 but I can't see a way to load the PEM file generated as above into ed25519.SigningKey.

How can I do it?

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