Did you find a way to do this? If you’re still looking, you can configure the tooltip in standard options for the visualization. It’s hard to say why VALUE is shown in the tooltip in your example without seeing the query or sample data.
try to play with grafana transformation like label to field or prepare time series, and you should get your tag value dynamically
Or you can try to add "|> group() "
this came from influxdb to deliver his data group by table or something like that.