Due to cucumber.json being removed with future release i'm looking for an alternative, currently we are using cucumber reports which uses .json to publish cucumber reports on Jenkins.
Actually we have recently decided to keep the json formatter. It is entering in maintenance: it won't accept new features, only major fixes.
When you talk about cucumber reports, I guess you are talking about the jenkins plugin, not about https://reports.cucumber.io?
However, we encourage using a new json formatter, which converts new cucumber messages into the legacy json format. It is available here: https://github.com/cucumber/cucumber/tree/master/json-formatter
That standalone json formatter is the one being actively developed. Is is based on our more recent architecture and compatible with all recent cucumber implementation.