Android : Way To Reference Asset Images From A Remotely Loaded Html Page In Webview?

I'm trying to load/reference images from the app's assets folder from within a HTML page in a WebView. Unlike in most of the examples the HTML page itself is not located in the assets folder but is loaded from a server via http. The background of this question are some performance improvements which should reduce the loading time (and the amount of transferred data) by loading static images directly from the device. I'm not sure if Android has some restrictions here because there's a certain possibility to exploit the app by allowing access to the local file storage from a remotely loaded webpage.