How to integrate Unity WebGL with Angular 5?

I'm not able to integrate Unity WebGL build which was build with Unity version lower than 5.3 and want to integrate it with Angular 5. I didn't find easy to implement and useful link after googling so much.

I'm not able to load UnityLoader.js file neither at index.html nor through angular.cli.json (i.e. at scripts:[]). I simply want to my load unity part at particular component only instead of global scripts if possible.

Any helpful link or doc will be highly thankful which can solve my purpose.