This deals with generating Extent reports for Cucumber-JVM version 4.3 and above by using a Maven Plugin which parses the Cucumber JSON report. For more details refer to this article

<dependency>
    <groupId>tech.grasshopper</groupId>
    <artifactId>extentreports-cucumberjson-plugin</artifactId>
    <version>1.1.0</version>
</dependency>