Then instead of asking here, ask whoever controls what software you can install.

I am surprised at such negative responses.

I am asking about alternatives to LibreOffice for a reason (stated)

Pandoc library and Microsoft Markitdown -- that other helpful comments suggested -- seem like two options that might actually work in my case and I will give them a try. My asking here was fruitful.

Running python and using python libraries is allowed on our work pcs but not running arbitrary software and EXEs with or without an installer. I cannot override company security policy, and cannot simply "talk to" our infosec team and get them to allow me to install stuff. Hope this clarifies.

You can put it on and USB stick, see e.g. https://portableapps.com/, this includes a package manger and other tools.

And potentially get fired for using unauthorised software on a corporate machine. Or find out tha USB storage is disabled (which is better than getting fired).

That is horribly Draconian. You need to find a better place to work.

"Unauthorized software" is a thing where you work? OMFG.

Then talk to whoever manages your machines.

Ah yes, your workplace is under the control of the Microsoft Priesthood who have declared that the masses under their thumb will adhere to the law of Redmond, that no other religion will be tolerated. You need to find a better place to work.