I thought I understood how to make a bar chart in SAIL, but apparently I'm m

I thought I understood how to make a bar chart in SAIL, but apparently I'm missing something. The expression below produces the chart which is shown in the attached screenshot. I'd like each bar to have its own label next to the bar, and I thought this was done using the categories parameter, but it's grouping all three bars into the same category. How do I assign each bar to its own category so that it can have its own label?

a!barChartField(
label: "Safety Incident Pyramid",
categories: {"test 1", "test 2", "test 3"},
series: {
a!chartSeries(
label: "test 1",
data: 5
),
a!chartSeries(
label: "test 2",
data: 50
),
a!chartSeries(
label: "test 3",
data: 150
)
},
showDataLabels: true
),

OriginalPostID-213863

OriginalPostID-213863