Amazon MWS API - How do you call SubmitFeed when your meteor and npm?

Question

I am running this code from meteor. I currently call

import { mws } from 'mws-nodejs';
import Future from 'fibers/future';

const getASINDetails = (asin) => {
  let future = new Future();
  console.log("getting ASIN.....", asin);

  mws.products.GetMatchingProduct(
    {
      "SellerId" : sellerID,
      "AWSAccessKeyId" : AWSAccessKeyId,
      "SecretKey" : SecretKey,
      "MWSAuthorizationToken" : MWSAuthToken,
      "AmazonServicesURL": "mws.amazonservices.com"
    }, {
      MarketplaceId: MarketplaceId,
      ASINList: {
          'ASINList.ASIN.1': asin
      }
      }, true, function (err, data) {
      
        console.log("do something with the data");
      
      }
  );
  return future.wait();
};

If i then want to call SubmitFeed() from mws.

I can't figure out the right syntax to execute the function pass in the amazonenvelope:

let sXML = `<?xml version="1.0" ?>
<AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="amznenvelope.xsd">
    <Header>
        <DocumentVersion>1.01</DocumentVersion>
        <MerchantIdentifier>MERCHANT_IDENTIFIER</MerchantIdentifier>
    </Header>
    <MessageType>Product</MessageType>
    <PurgeAndReplace>false</PurgeAndReplace>
    <Message>
        <MessageID>1</MessageID>
        <OperationType>PartialUpdate</OperationType>
        <Product>
            <SKU>UNIQUE-TO-ME-1234</SKU>
            <StandardProductID>
                <Type>ASIN</Type>
                <Value>B000A0S46M</Value>
            </StandardProductID>
            <Condition>
                <ConditionType>New</ConditionType>
            </Condition>
        </Product>
    </Message>
</AmazonEnvelope>`;

I am thinking the code should be something like this? But have not idea as I can't figure out their API...

How do i call SubmitFeed() and pass the XML?

Also how do i know if Submit feeds is available from mws.product

Thanks in advance.