Is `Rule` keyword supported?

I've looked into the [spec][1] and all [test data][2] and couldn't find any mention of `Rule` support. Did I miss something or there is only `Gherkin 5` support? Is it planned to support `Gherkin 6`?




[1]: https://github.com/cucumber/cucumber-json-schema/blob/main/schema.json
[2]: https://github.com/cucumber/cucumber-json-testdata-generator