This is my experience ( for others it may be different) but its fairly difficult. Can't comment on management quality of Saregama or other erstwhile Indian labels of today, but earlier, there was almost criminal negligence and apathy. There were news reports of the master tapes catching fungus and rotting in HMV vaults. And the many of the official CDs that were released, were very poor quality LP rips (like they did not even clean the LP before ripping). in the absence of good sources, any high res encoding is still going to sound, well, low res.
of course there are exceptions, this was one where some effort was made to clean up sound and slightly better production values.
https://www.discogs.com/Various-50-Glorious-Years-5-CD-Pack-/release/11683433
There will be others. And you will find Clean(ish) Hifi streams on Tidal. Don't only go by sampling rate and format. In many cases, it's not worth what you would pay for a high res recording. I would love to be corrected on this.
Edit: If you do find any good sources for High quality old Hindi music (vs simply high res) please do share on this thread.