How to work with node-xlsx library?

Question

excel

Hello!
At work, you need to compile an xlsx file according to the "Timesheet" layout, here is a link to an example: ppt.ru/rabochee-vremia/zapolnenie-tabelya I
studied the documentation, but nothing is really clear from it.
Maybe someone used this library and knows how, for example, to combine several cells into one, how to make several more rows and rows inside one cell, how to write formulas for cells (addition, multiplication, and so on)?
Thank you!