Display only certain tags from multi-select field in chart?

Is there a way to create a chart based on a multi-select column, but display only certain tags from that column? The specific case - I have an x-axis that is based on a multi-select column “Territory Availability” with 245 possible tags representing global regions, I’d like to be able to create a chart that would show a smaller set of these tags - 25 specific regions. I’ve tried to create a separate column which the app could reference, but the original column is automatically updated by a data feed on daily basis which has complicated other attempts to isolate the 25 regions I want to represent.