Set Standard Set of Datasources for a collection of dashboards`

We have a large collection of dashboards which all reference the exact same list of log-analytics instances. When we add a new log analytics instance, we have to go into every dashboard (and potentially every query and variable declaration) and update the list. This is painful, and potentially dangerous since we use the same logic for alerting, and this could lead to missed alerts for new instances.

Is there a way to create a named list of log analytics instances and have all the dashboards/alert queries refer to that?