How to conditionally execute a command based on passed argument

I have app MyApp which is an Angular app but it has to be wrapped into a .war archive MyApp.war since I have to deploy it to Liberty server.

I have exec-maven-plugin set as below with exec goal to run npm install command

<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<id>npm-install</id>
<phase>prepare-package</phase>
<goals>
<goal>exec</goal>
</goals>
<configuration>
<executable>npm</executable>
<arguments>
<argument>install</argument>
</arguments>
</configuration>
</execution>
...


With this configuration of exec-maven-plugin, the npm-install execution will run npm install and will ALWAYS install ALL dependencies specified in package.json.

I want to omit installing dependencies specified in optionalDependencies section of package.json if an EnvName argument is passed to exec-maven-plugin.

QUESTION: How do I make the exem-maven-plugin npm-install execution receive an argument named EnvName and if EnvName is equal to test, execute npm install --include=optional and if EnvName is not equal to test execute npm install --omit=optional?

I have tried modifying the exec-maven-plugin configuration like below, and that would execute fine but would not install optional dependencies regardless what I pass as EnvName.

<arguments>
<argument>install</argument>
<argument>
<!-- If EnvName is 'test', include optional dependencies -->
${EnvName.equals('test') ? '--include=optional' : '--omit=optional'}
</argument>
</arguments>

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