I want to stick "Passwords don't match" message to verifyPassword field.

First attempt:

verifyPassword: Joi.any().valid(Joi.ref('password')).options({language: {any: {allowOnly: "Passwords don't match"}}}) 

Failed. Result is "verifyPassword Passwords don't match". Joi prefixes message with label and it seems there is no way to turn it off.

Second attempt:

verifyPassword: Joi.any().valid(Joi.ref('password')).options({language: {any: {allowOnly: "Passwords don't match"}}}).label('')

Failed. "smart" check inside Joi prohibits empty labels...