Thanks, I think I understand now. Unfortunately this exact functionality doesn't exist at the moment. I believe this open Github issue describes what you want to do: https://github.com/elastic/kibana/issues/3090 (let me know if I'm wrong). I'd urge you to add your input to that ticket, explaining your use case. That will help the team design a better solution if they decide to add this feature.
In the meantime I can recommend a possible workaround. It's not as nice as having the info in a tooltip, but it might work.
First, create two visualizations. The first would be a line chart with timestamp on the x-axis, split lines on TradeID. The second would be a Metric visualization with a "Top Hit" metric with
TradeState selected. The second agg config would look like this:
Next, add these two visualizations to a dashboard side-by-side. You can then click on points in the line chart to create filters, and once the filters are applied the Metric visualization will show the value of
TradeState for that
TradeID at that time. You can then remove the filters by hitting the back button. Here's how it would look with everything together:
I imagine this might be too cumbersome for your use case, but I figured I'd mention it just in case it helps!