I've used my Ledger Nano S, connected to MEW, with tokens that (afaik) weren't listed on Ledger Live (I cannot stand that wallet and I avoid it). All I had to do was to enable tokens in the ETH app.
I don't know, at least the open source HW could be investigated by the coin developers and maybe try to implement themselves that apps/addons for their coins? (Is that possible?) It could be quite an advertising for the coins too...