How to apply plugin to @middy/validator?

I'm writing a validation schema for a serverless endpoint using ajv and this @middy/validator middleware. There is a note in documentation that the middleware can use external plugins. But it's not clear how to apply them, and there is no example. I want to use ajv-errors plugin for custom error messages,

Please drop me a link about how to apply an external plugin or give me an example. Thanks in advance!

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