@AqMarek there is no snippet when it comes to this example, generating a chart from scratch (i mean with no previous chart created in the document itself) is a bit complex. the main and general approach we take to deal with these kinds of rich objects in docx, xlsx is that we expect these objects to exist in the document, as part of the template and in runtime we just configure it or tweak it to achieve the desired result in the final document.
this approach works really well and it seems it works for all the users so far (i mean i just remember just a few moments users wanted to generate something from scratch without it existing in the document itself). is it something stopping you to use this approach? i mean creating a xlsx document that works as a template and that in runtime we just process it to get the desired output, this can be done by using the xlsx recipe (not the html-to-xlsx recipe), like this example