[mbed-tls] Code samples for psa_import_key and ECC?

I am trying to use psa_import_key() after loading private keys from PEM files. I am succeeding when parsing an "RSA PRIVATE KEY", but no such luck for "EC PRIVATE KEY". I assume that I am not setting attributes correctly. A code sample would be nice!

Or, maybe I could just use mbedtls_pk_parse_keyfile(), but then I would need to "import" a PSA key from the "mbedtls" context, ad I did not find sample code for that either.

-- Christian Huitema