How to stream RTSP on the web?

We generate RTSP stream (MP4 with ACC codec for audio) on our server and we need to send it to web app and play it.

We could send it via websocket and play it with media extensions but they are not supported on iOS.

We could also use WebRTC with media channel but that supports only Opus audio codec and we cannot afford transcoding from ACC to Opus.

Do you have any idea how can we play RTSP data on iOS devices?

EDIT: we aim for low latency playback (<1s) HSL has latency 5s+