User Defined Repository

Can't we deploy the java code to a custom repository that is created in nexus? When you click on "Create Robot Process" in console, the repositories dropdown doesn't show the custom created repository! 

Also is there a way by which we do the steps as mentioned in this below doc where we do the java steps first and import that into console? I am using a appian trial website btw.

 https://docs.appian.com/suite/help/20.2/rpa/setup/maven-setup.html

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