Using ethers and metamask to sign plaintext message?

[grapevinegizmos]

I've been able to use metamask and ethers to request that a user sign a hash of a message, but what I'd like to do is display the plaintext of a message and ask an account holder to sign the plaintext. I've been unable to figure out how to do that using Signer.signMessage(),
although it seems like it should be possible per the documentation. I get an arrayify error message if I supply a plaintext string, rather than arrayify(keccakhash(string)) to the method.

For a more complete description of the problem, see the stackoverflow question here: https://ethereum.stackexchange.com/questions/136351/is-it-possible-to-use-metamask-to-sign-a-plaintext-message

Is it possible? If not, it is planned to be possible?

[Salmandabbakuti]

Have you tried this way:

const provider= new ethers.providers.Web3Provider(window.ethereum);
const signer = provider.getSigner();
const message= "Hello Ethers!"
const signature = await signer.signMessage(message); // this will trigger metamask for signature request
const verify = ethers.utils.verifyMessage(message, signature)