If you are only building a custom NAR, you should be able to use one of the Gradle plugins from the list that was posted here. Building all of NiFi as a Gradle project may not be quite as feasible, but I believe a 'gradle init' can (almost?) convert the project into a Gradle build. You may also want to look at Gradle plugins that are similar to the Maven plugins we use for the project such as identifying vulnerabilites in dependencies, checkstyle (if you have such a requirement), etc.
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