Injecting css for Webview with custom font

Question

I have working with webview in which i want to inject css to webview that i have achieved with the following link.

But if i want to add custom font to css i have using the following code

@font-face {
    font-family: 'avenir_next'; /*a name to be used later*/
    src: url('OTF_FILE_LINK'); /*URL to font*/
}

body {
    font-family: avenir_next;
}

I need to know that its is possible to load otf file from the Android Asset folder insted of using 'OTF_FILE_LINK'.