Looks like I finally got it!
# Get our's system's token
token = URL.token(host)
# Get our's system's public key
public_key = URL.public_key(host)
# Make it a Joken token
token = Joken.token(token)
# Verify token with public key
with_signer = token |> Joken.with_signer(Joken.rs256(JOSE.JWK.from_pem(public_key)))
{:ok, claims} = with_signer |> Joken.verify!
IO.puts("#{inspect claims}")
Thx for the pointers!! If there is some user oriented docs I missed reading, would love to read them!
Thx for the tool! 
Quentin
