This is related to #14150 and possibly others, but it's actually a separate issue.

For instance, when using the following query:
`bitcoin-cli scantxoutset start '[{"desc":"wpkh(xpubABCDEF/0/*)", "range":100}]'`
I can get a list of UTXOs, but no way to get back the index which derived that particular UTXO. So it's not much better than deriving on the user side and specifying addresses one by one, so that I already have a cache of addresses to match.

Not sure what the solution looks like. One way is to repeat the full descriptor in the utxo. That might get verbose though.
"  \"tx\" : [               (array of string) The transaction ids\n"
            "     \"transactionid\"     (string) The transaction id\n"
            "     ,...\n"
            "  ],\n"
            "  \"time\" : ttt,          (numeric) The block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"mediantime\" : ttt,    (numeric) The median block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"nonce\" : n,           (numeric) The nonce\n"
            "  \"bits\" : \"1d00ffff\", (string) The bits\n"
            "  \"difficulty\" : x.xxx,  (numeric) The difficulty\n"
            "  \"chainwork\" : \"xxxx\",  (string) Expected number of hashes required to produce the chain up to this block (in hex)\n"
            "  \"nTx\" : n,             (numeric) The number of transactions in the block.\n"
            "  \"previousblockhash\" : \"hash\",  (string) The hash of the previous block\n"
            "  \"nextblockhash\" : \"hash\"       (string) The hash of the next block\n"
            "}\n"
            "\nResult (for verbosity = 2):\n"
            "{\n"
            "  ...,                     Same output as verbosity = 1.\n"
            "  \"tx\" : [               (array of Objects) The transactions in the format of the getrawtransaction RPC. Different from verbosity = 1 \"tx\" result.\n"
            "         ,...\n"
            "  ],\n"
            "  ,...                     Same output as verbosity = 1.\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getblock", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
            + HelpExampleRpc("getblock", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
        );
    LOCK(cs_main);
    uint256 hash(ParseHashV(request.params[0], "blockhash"));
    int verbosity = 1;
    if (!request.params[1].isNull()) {