SparkLine / tooltip properties

#1

Which are the properties that can be applied to a Sparkline in the UI?
In detail I would like to add the date in the tooltip that appears when moving the pointer on the line that the Sparkline shows

“sparkline”: [
{
“field”: “MyCompoundMetric”,
“type”: “line”,
“name”: “My Metric.”,
“color”: “green”

                },
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