Sencha Charts - how to access series from the renderer?

Ho do I access the series from within the series' renderer or the label's renderer?

I don't see an easy way to do this unless I set these configs in the series' constructor.

Scope in both renders is Ext.chart.series.sprite.Bar.

Code:

Ext.define('MySeries', {
    extend: 'Ext.chart.series.Bar',
    ...
    config: {
        ...
        renderer: function (sprite, config, renderData, index) {
            ...
            // how to access myMethod here?
            return attrs;
        },
        label: {
            ...
            renderer: function (value, sprite, config, renderData, index) {
                // how to access myMethod here?
                return value;
            }
        }
        ...
    },
    myMethod: function () {


    }
    ...

Sencha Charts - how to access series from the renderer?