Finally I could do that overriding the method what the property "assets" accepts.
assets: function(path) {
/**
* Loops every path and returns path|true|false according what we need
* @param path file or directory's path
* @returns path if it is a directory
* true if it fit with the regular expression
* false otherwise
*
*/
if( /\/$/.test(path) ) return path;
return /^app\/.*\.html/.test(path); // RegExp for anything we need
}