Drag tags from tag browse tree to different axis on same cha

Hi - wondering if it’s possible to use the onTagsDropped method of the easy chart, or some other scripting method to determine which of 2 tag browse trees I dragged the tag(s) from, and then depending on which one assign them to specific Y axis on the chart. For example I’d have 2 tag browse trees on the left, and 1 chart on the right. If I drag a tag from the top tag tree onto the chart, I’d like it to use the Y axis on the left side of the chart (0-100 say). If I drag a tag from the bottom tag tree onto the chart, I’d like it to use the Y axis on the right side (0-10000 say).

I’ve tried using the onTagsDropped method of the chart but it doesn’t seem to include information about where the tags came from (which tree), only the tag paths which don’t include that.

If anyone has any ideas that would be great. Thanks