It's great new to see Spotify announce Hi Fi quality, however, in order to make it really interesting to have a hi fi library with Spotify, it's necessary to have local files support for FLAC, ALAC or other hi res local file formats. What is Spotify intending to do about this? Or do they plan to have Apple Music stay ahead?
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ALAC encoded *.m4a files are already supported in the Spotify desktop app, at least in Windows 10, not sure for the macOS version, but I guess it also works. It is using the internal ALAC decoder in Windows 10 for this, so your Windows version should have one. Also note that the file extension should not be capitalised, otherwise it will not recognise them (same as for *.mp3 files).
In the latest desktop version direct FLAC support has already been implemented and works fine, at least for me in version 18.104.22.1682.g6ad9c215-a on Windows 10 Home version 21H1. See also this related thread and staff reply: