Must you write code to get support for custom keywords/formats? [workaround available]

Since this is a cli I was hoping I could just reference a `keywords.txt` file or `formats.txt` file, but it doesn't appear that's an option.

I'll try try to follow an example from the ajv-keywords repo.

Perhaps I could even tie together a text file option once I've figured this out a little bit more.

UPDATE: 2021/05/05 For those with a similar question, I've written an npm package to address this (although not with a lot of flexibility). The details are below in this [comment](https://github.com/ajv-validator/ajv-cli/issues/128#issuecomment-820381362)