'JavaScript tooltip generator in Apache Superset is not showing the data

I am new to Apache superset and I am trying to add a JavaScript tooltip to a geo map visualization.

I am using this piece of code in the "JavaScript tooltip generator":

d => "<div>field: <strong> ${d.object.props.ColumnName_Test} </strong></div>"

The value of the column name is not visible on the tooltip, but the hardcoded column name is visible:

I have googled a lot, but there is no documentation about how to use the JavaScript tooltip generator in Apache Superset.

Does someone know what I need to change in this piece of code to show the value of the column, instead of the column name?

Solution 1:^[1]

Did you first add ColumnName_Test variable to the "Extra data for JS"?

Check also this link

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Solution	Source
Solution 1	mona-mk