There's an alternative project that runs Windows apps in a VM but integrates them fully and transparently into your Linux desktop, with MS Office particularly tended to. The apps run as if they're native to Linux. It was discussed here just this past week.
I wouldn't hold my breath. I've been trying to get them to switch for the better part of a year, and even Windows Update completely bricking my mom's computer [1] (look at my post history if you want more details on that) wasn't enough to convince them. I'm not sure what else could happen outside of Bill Gates personally leaving a flaming bag of dog manure on their porch.
[1] I'll say it again; if anyone here works on Windows Update, please consider getting out of the software game and maybe consider a job in the exciting world of janitorial or food service, because you are exceedingly bad at the whole "software thing" and you should be ashamed of yourself and how much damage you have cost the entire world with your utterly incompetent software.
If it doesn’t say Microsoft Office on there, they will say it’s worse. Objectivity has little to do with it.
In a bit of fairness, my dad makes extremely liberal use of the VBA in Excel, and I am not sure how compatible OnlyOffice is for that.