Hello. I am trying to implement benefit points which are used to estimate and compare the value of different issues. What I want to accomplish is to add another number next to the story point estimates in the backlog, as illustrated here:
I have so far only been able to add a custom field for the issue view like this:

Later on I might want to be able to manipulate this number and calculate the benefit points of stories based on the benefit points of epics or for each task, display the amount of benefit points divided by its cost.
I am using the team-managed project type.
I have tried to extend Jira with atlassian-connect-express through the generalPages and
jiraIssueTabPanels, but this might be overly complicated for my use case.
What would be the best approach to try to create something like this? Any help is greatly appreciated.