Is there any other solution? Every idea appreciated.
Why not use the publish to web functionality of Google Sheets? Get the free content formatting macros add-on which will give you an iframe macro. Or if you have the html macro enabled yo could use that. Then go into you google sheet and go to File -> Publish to web. Select the embed option and then either select the sheet you want to embed or the whole document. It will give you some iframe code to embed the Google Sheet. Either paste the into the html macro or add an iframe macro and put in the href that is given in the code into the iframe href property.
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