Regarding the comment in the readme iOS's API currently does not allow opening app's notification settings directly., it looks like this has been made available in newer versions. I found an example in the zulip mobile repo:
https://github.com/zulip/zulip-mobile/blob/4d9d46d7f852af3fb4d44463654a141141e7bac3/src/utils/openLink.js#L42-L52