Is there a way to assign Portfolio "Initiatives" and "Themes" to issues from Jira? This would make it easier than having to give permissions to Portfolio to all our Jira users and have them learn that interface.
You are only able to set Themes within Portfolio Plans. It is not a field available for searching or editing in JIRA Software.
However, Initiatives can be set using the Parent Link field. Please take a look at https://confluence.atlassian.com/jiraportfolioserver/showing-portfolio-custom-fields-in-jira-857058481.html