Bubble Chart labels disappearing

Hi,
Is there a way to automatically update Data labels in a bubble chart, when the data series change?

Issue: each time I add new influencers and refresh the charts, the data labels drop out
Each bubble needs to have the Stakeholder Initials as the Data Label, found on the Chart Data tab in the 3rd column (initials)

I know how to do this manually, but have no idea at all how to automate this.

Can anyone help?Chart.png
Chart data.png