Ok so it does, DDCs are things that do exist. I have no idea if there is one with usb in and optical out. A standard toslink cable can have an end made into a 3.5 mini optical with a cheap clip on adapter, blu jeans sell one.
It’s a very convoluted idea though where you are turning your remote streamer into a steamer that you have to get up to use by streaming with a different device that attached to it using 2 devices and 2 cables. Honestly I’d either just download the bluos app to the iPad and use it as a controller for whichever of qobuz or tidal i switch to or I’d get rid of the node and replace it with a DAC and attach the iPad to it by usb for Apple Music.