At the moment, the feature to show total number of story point for each column is only available for Scrum board (Backlog mode).
It would be great to have this feature to be implemented in Work/Active Sprint mode of Kanban Board. This will help the users to keep track of what's on their plate. The issue count is not enough, because each issues would have different story points.
I built this simple chrome extension to add Story Point totals to Kanban/Swimlane views:
Give it a try, and leave a review! I couldn't test it on different versions of Jira, so hoping it works as well for everyone.