[synchrone]

This person had the exact same issue with their child, developed an app for this and got banned from play store: https://habr-com.translate.goog/ru/post/421451/?_x_tr_sl=aut...

The app is available as a standalone APK now: https://channelwhitelist-tilda-ws.translate.goog/?_x_tr_sl=a...

Unfortunately i could not find sources, but it works rather well and has English UI as well