As far as I can tell, there is no way currently to nest a simple task or story into the initiative or hierarchy above epic for it to be included in the scope. There are a few bodies of work that are too small to be an epic, but are part of an initiative.
As seen below, Portfolio only gives the option of added epic when adding new issue under initiative. My current Issue Type hierarchy is: Initiative > Epic > Story/Task

If this is true, Portfolio forces the user to have direct nesting as seen here https://www.atlassian.com/agile/project-management/epics-stories-themes :

This forces me to either
- change that simple task into an epic
- nest it under an unrelated epic so that it will be included
- make a placeholder epic of no value and nest it under that
All of these are not incredibly helpful. Is there a workaround, something less clunky, or potentially something that I am doing wrong?