Usage of server side api

We've already our web app (.aspnet core) with all the the necessary stylesheets and layouts in place therefore using your client wouldn't probably make sense. But I would like to use your server-side api project which gets created when you choose Angular as framework. I like the idea to create all crud operations very fast and publish them via api REST calls. But I'm not really sure whether this would be a good approach, What about the localization and security stuff, what of the functionality Radzen offers could then be used and what not?

Could the .net core based api created by an Angular project be used by other Applications, for example mobile apps?