Access Dynamic Data Tags values in JS

Context
I have an idea of showing calculation fields values in a chart (Bricks Extras dynamic chart element).

Currently the dynamic chart doesn’t support values that change without page refresh BUT I’ve texted David from BricksExtras and he said that with the next version it will be possible to do this via JS (and many other things).

An example inside dev docs for updating dataset values:

/* Get the chart instance */
const myChart = xChart.Instances.auxrry 

/* Change first data set to these values */
myChart.data.datasets[0].data = [
    20,
    30,
    40,
    50,
    60
]

/* Change second data set to these values */
myChart.data.datasets[1].data = [
    60,
    30,
    20,
    10,
    15
]

/* always update chart to see changes */
chart.update();

Question
So back to my question: @Daniele I’d love to know how to access the {brf_form_calculation} inside JS?