How to plot a graph based on metric tag value instead of metric count?

Question

I have the counter() metric published with tag values. For example metric as counter - education.app.count with tag/value - [name=edu_class_one , students=23, category=primary, teachers=4]

Need to plot a graph based on 'students' tag value over Y axis ? i.e to see what has been the students value trend over time for this metric.

Able to only plot the metric's count with tag values as filter (from) clause.