Migrate from v2 to v4

[MahamoudTBS]

Im attempting to convert the following code from v2 to v4.
Due to the breaking changes after v2, I'm unsure how to convert asKey and Keystore to equivalent methods in v4.

An attempt at converting asKey to importPKCS8 resulted in the following error message:
"pkcs8" must be PKCS#8 formatted string

Below is a snippet of my v2 code:

const { JWK: { asKey }, JWKS: { KeyStore } } = require('jose')
let keyStore = new KeyStore();

const keyObj = {
key: fs.readFileSync(akeyPath, 'utf8'), // -----BEGIN ENCRYPTED PRIVATE KEY-----
passphrase: secretKey
}

const options = {
"kid": "******************_sig_es256",
"use": "sig",
"alg": "ES256"
}

const key = asKey(keyObj, options)
keyStore.add(key)
return ks.toJWKS(true)