Formatting Tooltips on Chart

I'm trying to format the tooltips on the Highcharts Column Chart. Currently I've got this:

At minimum, I'd like to round it to have no decimal places, but ideally I'd like to round it to 3 significant figures and add a thousand separator (e.g. in that instance it would be 32,400.

I've been playing with the plotOptions properties & can't make any noticeable change to the value displayed ( tried point.x & point.y to see if that makes any difference). I know I'm in the right area, as if I set distance to 160, it does move the position, so at leats that is applying correctly.

        tooltip: {
            pointFormat: '{point.x:,.0f}',
            shared: true

For context, I'm applying the json here:

Any suggestions?

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