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How to create ed25519 subkey in GPG?

At the moment GPG only offers the following options when generating a new subkey the with the `addkey` command:
```
gpg> addkey
Please select what kind of key you want:
   (3) DSA (sign only)
   (4) RSA (sign only)
   (5) Elgamal (encrypt only)
   (6) RSA (encrypt only)
  (14) Existing key from card
Your selection?
```
None of them uses the ed25519 elliptic curve. Yet it's possible to use this curve when generating a totally new key, so presumably it's somehow possible when creating just a subkey as well?