Custom error/warning message?

Is it possible to pass in a custom error message? Maybe something like this:
```
{
    files: ['foo/bar/*.ts'],
    rules: {
        'filename-rules/match': [
            'error',
            {
                regex: /(.*?)\.(get\.ts|post\.ts)$/,
                message: 'Files extensions must follow the convention of: {.get.ts, .post.ts}'
            }
        ]
    }
}
```
