Are there any plans to implement support for custom functions?

[bejohu]

Are there any plans to implement support for custom functions?

It seems like this might be quite helpful in some caes, for instance for re-using JMESPath expressions originally written in other languages, e.g.

• https://github.com/jmespath/jmespath.py#custom-functions
• https://github.com/burtcorp/jmespath-java#adding-custom-functions