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>jp.ikedam.jenkins.plugins</groupId>
<artifactId>scoring-load-balancer</artifactId>
<version>230.226.v4b_6f3c1b_b_a_f8</version>
</dependency>