[TW5] how to load .XLSX from external site?

[sini-Kit]

Hi! I try to learn TW5 external library mechanism and new .XLSX  plugin http://tiddlywiki.com/prerelease/editions/xlsx-utils/#%24%3A%2Fplugins%2Ftiddlywiki%2Fxlsx-utils

I have created test external library with one plugin http://novye-podarki.ru/library/v5.1.12/index.html

all plugins are simple .json files like this http://novye-podarki.ru/library/v5.1.12/recipes/library/tiddlers/%2524%253A%252Fplugins%252Ftupper%252FBaseGoodImagesParts.json

and is it possible to make library of .xlsx files and load them by GET as we make it with .json files?