Text marker with offset percentage values

New To Observable
1

Percentage values on my horizontal stacked bar chart gets automatically re-adjusted to a [0, 100] domain when data is grouped with offset : 'normalize' (I can see that in the tip by adding "tip: true").

Is it possible displaying this calculated value on a dedicated text mark?

Here’s my plot config:

Plot.plot({
    width        : 800,
    height       : 600,
    marginLeft   : 100,
    color        : {
        legend   : true
    },
    x: {
        axis     : 'bottom',
        percent  : true,
        domain   : [0, 100],
        ticks    : [0, 20, 40, 60, 80, 100]
    },
    marks: [
        Plot.barX(
            data,
            Plot.groupY({
                x    : 'proportion',
            },
            {
                y      : 'gender',
                fill   : 'age',
                tip    : true,
                offset : 'normalize'
            })
        ),
        Plot.text(
            data,
            Plot.stackX(
                Plot.groupY({
                    x          : 'proportion',
                    text       : (d) => `${((100 * d.length) / total).toFixed(2)} %`,  // Need to show the offset value
                }, {
                    z          : 'age,
                    y          : 'gender',
                    fontSize   : fontSize,
                    fontWeight : '500',
                    offset     : 'normalize'
                })
            )
        )
    ]
})