Encontré que la solución pasa custom_indicators_getter en los accesorios para ver los accesorios predeterminados como este

 custom_indicators_getter: function (PineJS) { return Promise.resolve([ { name: "Bar Colorer Demo", metainfo: { _metainfoVersion: 51, id: "BarColoring@tv-basicstudies-1", name: "BarColoring", description: "Bar Colorer Demo", shortDescription: "BarColoring", isCustomIndicator: true, isTVScript: false, isTVScriptStub: false, format: { type: "price", precision: 4, }, defaults: { palettes: { palette_0: { // palette colors // change it to the default colors that you prefer, // but note that the user can change them in the Style tab // of indicator properties colors: [{ color: "#FFFF00" }, { color: "#0000FF" }], }, }, }, inputs: [], plots: [ { id: "plot_0", // plot type should be set to 'bar_colorer' type: "bar_colorer", // this is the name of the palette that is defined // in 'palettes' and 'defaults.palettes' sections palette: "palette_0", }, ], palettes: { palette_0: { colors: [{ name: "Color 0" }, { name: "Color 1" }], // the mapping between the values that // are returned by the script and palette colors valToIndex: { 100: 0, 200: 1, }, }, }, }, constructor: function () { this.main = function (context, input) { this._context = context; this._input = input; var valueForColor0 = 100; var valueForColor1 = 200; // perform your calculations here and return one of the constants // that is specified as a key in 'valToIndex' mapping var result = (Math.random() * 100) % 2 > 1 // we randomly select one of the color values ? valueForColor0 : valueForColor1; return [result]; }; }, }, ]); }, And after this onChartReady

tvWidget.onChartReady(() => {

//Bar Colorer Demo es el nombre que pasamos en la descripción widget.activeChart().createStudy("Bar Colorer Demo", false, true); })