I've seen resources for that: https://www.howtogeek.com/435975/how-to-show-an-outlook-cale....
Let me know or shoot me an e-mail at bruno at hera dot so if you need any help!
The trouble with this method is that it creates a publicly-accessible, unauthenticated feed of my calendar and all the event data in it. I don't deal in a lot of particularly sensitive trade secrets, so I'm less concerned than others on this thread about the notes being unencrypted in your cloud. Encryption would be great, but I have a reasonable expectation that you're not just letting anybody who finds it scoop up your whole database. But that's what publishing a calendar feed does. I can't leave an open door to the internet (however obscure) to all the potentially confidential information that someone might send me as part of an event. I'll have to wait for "real" exchange support.
I have a blocker on plugging it in, though: we're a Microsoft Exchange shop. Now, it's easy to sync Exchange to my Mac calendar, but it is not easy to sync Exchange to Google calendar. (Googling, seems like the most reliable way is to PUBLISH your calendar... something I don't think my security / IT folks would appreciate.) I could also use Zapier it looks like, but I'd quickly run over the 100 tasks/mo in the free tier.
I have nothing against electron—power to you for solving a real problem I have, and using javascript to do it quickly. But I do think popping open EventKit to hook into the system calendar would be a solid next feature. Then people like me who are locked into Exchange will be able to use your product without ugly/brittle/security-degrading hacks.