Full syntax support for Cloudflare Firewall Rules language

Hi!

I've been looking into writing unit tests for firewall rules using wirefilter. However, as far as I can see, wirefilter doesn't support the full syntax of Cloudflare [Firewall Rules language](https://developers.cloudflare.com/firewall/cf-firewall-language/). For instance, as far as can I can see it's not possible to express complex types, e.g. arrays, as well as transformation functions.

Do you know if wirefilter is planning to support the full cloudflare syntax, or is it going to support the current set of expressions only?