As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
    <groupId>org.ukiuni.callOtherJenkins</groupId>
    <artifactId>call-remote-job-plugin</artifactId>
    <version>1.0.21</version>
</dependency>