OneSignal push notification custom sounds

I´m using OneSignal push notification with custom sounds. As for what it concerns the folder that the sounds should be at currently for android I have a folder at ‘www/sounds’ and for ios I have to add to the sounds folder in the xcode. They work fine this way but I would like to know if there is any other folder such as the ‘/resources/ios/icon’, that I could just add the sounds inside and don´t need to do these changes when building in different platforms it would do automatically. or another way to achieve this result.