bar chart Hover over data not available with touchscreen only

[mrfloppy88]

I have setup a Bar chart showing the daily delta's of some energy meters

when i hover over with a mouse i get to see the start and end time with the value of that day nicely below the main value

but when i have no mouse (only touchscreen) i can long press the bars, they turn a bit grey to indicate a selection, but i do not see the value or start-end times

currently the bar chart is quite unusable on touchscreens

with touch:

with mouse:

expected behaviour:
tap to select a bar and then show the data for that bar as long as selected, tap somewhere else to unselect