It's currently not possible to import (solvable) SegWit addresses (P2SH and native) using `importmulti`. I believe that's a shortcoming we should address before release.

My suggestion would be for P2WPKH (P2SH and native) to be supported without any extra arguments. This means that a P2WPKH address/script with corresponding private or public key should work. For P2SH it means checking if the supplied P2SH address perhaps matches the supplied public key or private key when converted to P2WPKH first.

To support P2WSH, I think we need an extra field "witnessScript". When supplied, it would either be required to match a P2WSH address/script directly, or if the address is P2SH, indirectly.
}
    if (fRescan)
    {
        RescanWallet(*pwallet, reserver);
        pwallet->ReacceptWalletTransactions();
    }
    return NullUniValue;
}
UniValue importprunedfunds(const JSONRPCRequest& request)
{
    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
    CWallet* const pwallet = wallet.get();
    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
        return NullUniValue;
    }
    if (request.fHelp || request.params.size() != 2)
        throw std::runtime_error(
            "importprunedfunds\n"
            "\nImports funds without rescan. Corresponding address or script must previously be included in wallet. Aimed towards pruned wallets. The end-user is responsible to import additional transactions that subsequently spend the imported outputs or rescan after the point in the blockchain the transaction is included.\n"
            "\nArguments:\n"
            "1. \"rawtransaction\" (string, required) A raw transaction in hex funding an already-existing address in wallet\n"
            "2. \"txoutproof\"     (string, required) The hex output from gettxoutproof that contains the transaction\n"
        );
    CMutableTransaction tx;
    if (!DecodeHexTx(tx, request.params[0].get_str()))
        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");
    uint256 hashTx = tx.GetHash();
    CWalletTx wtx(pwallet, MakeTransactionRef(std::move(tx)));
    CDataStream ssMB(ParseHexV(request.params[1], "proof"), SER_NETWORK, PROTOCOL_VERSION);
    CMerkleBlock merkleBlock;