In a scrum backlog, the story points appear in a badge to the right.

Unfortunately, that is not an option in the kanban backlog.  The workaround is to add the story points on a second row via the issue layout.  This means that fewer issues fit on the screen at one time, meaning that it's more difficult to navigate the backlog and to interact with it.

Could you please add the story point badges in to the KanPlan view?

Story points in Kanban backlog when field is added to backlog card layout:

Story points in Scrum backlog (note how the field does not consume additional vertical space unlike in Kanban backlog):