Umbraco Contentment Datalists - using 2 together and updating one on change of the other

In Umbraco 8 I'm using 2 Contentment datalists (from the Contentment Nuget package) in the back office Member profile, they work fine however is there a way to update the datasource of one of the dropdowns on the change event of the other?

I think if there is a was to create a hook into the on change I should be able to change the datasource from there.

thanks