Unable to register ChartjsPluginAnnotation in LWC

[srikanth0020]

I am leverage latest chartjs version 4.1 to incorporate donut graphs in salesforce LWC . The graph was generated but wanted to use the annotations available for donut graph as well. So have added chartjspluginannotaion.min.js file as well. Post that i have tried to register the ChartjsPluginAnnotation with below code. But the registration is not happening and am getting undefined in "console.log('window.ChartjsPluginAnnotation---'+window.ChartjsPluginAnnotation);" . Did anyone try to use the Doughnut annotation .

Promise.all([
loadScript(this,ChartJs),
loadScript(this,chartUMDJs),
loadScript(this,chartHelperjs),
loadScript(this,annotationPlugin),
]).then(() =>{
const ctx = this.template.querySelector('canvas.donut')
.getContext('2d');
console.log('window.Chart---'+window.Chart);
console.log('window.ChartjsPluginAnnotation---'+window.ChartjsPluginAnnotation);
window.Chart.register(window.ChartjsPluginAnnotation);
this.chart = new window.Chart(ctx, this.config);