My organisation has a Jira Data-Centre license (v8.20.10) with the Advanced Roadmaps for Jira plugin. Given this context, is it possible to define a Jira Software project with a custom issue (e.g. Initiative) and custom issue hierarchy (e.g. Initiative is the parent of Epic)? If it is possible, where can a Jira administrator find documentation that explains how to set this up? The advice I have received internally is that our current Jira licence can not support this request without additional plugins.
I am an end user, not a Jira administrator. Below are screenshots I have sourced from my organisations Jira instance. I am assuming that, since Advanced Roadmaps for Jira is listed on this page, that it is a plugin that is paid for, installed, configured and available to Jira System Administrators.

