what is output format of Utils? (using chartjs in vanillajs, not react/angular)

Question

I'm trying to load data for a bubbles chart from datafiles, the examples use a chartjs function to generate data.

Working through some of the examples, want to load csv/json files via d3.js as will be using data files from an api and front end not in react/angular.

examples so far. https://github.com/aspiringguru/chartjs_3.7.1_vanilla

I can't see the output format of Utils.* used in the examples.

expecting will need x,y,radius for each point. just need to work out what format chartjs expects the data in.

https://www.chartjs.org/docs/next/samples/other-charts/bubble.html uses

data: Utils.bubbles(NUMBER_CFG)

dataset.data = Utils.bubbles({count: chart.data.labels.length, rmin: 5, rmax: 15, min: 0, max: 100});

had a look at https://github.com/chartjs/Chart.js/blob/master/docs/scripts/utils.js and I can't understand the output generated from

function bubbles(config)