Angular 9 TypeError: $(nativeElement).gridstack is not a function

I'm trying to use ngx-grid-stack in Angular 9. But I'm stuck in this error showing up in the browser console: 

TypeError: $(nativeElement).gridstack is not a function. (In '$(nativeElement).gridstack(this.options)', '$(nativeElement).gridstack' is undefined)

I think it has to do anything with jquery. But I'm not able to fix it. Am I doing anything wrong? Or does anyone know how to fix it?