Change default font for all Microsoft 365 apps

Hello!

I'm wondering if it's feasible to modify the default font across all Microsoft 365 applications, including Desktop, Online, and mobile apps for all users in the organization.

I've managed to figure out how to change the default font for the Desktop versions of Excel, PowerPoint, Word, and Outlook, as well as Outlook OWA and the new Outlook for Windows.

However, I'm having difficulty finding the steps to do this for the online applications of Word, PowerPoint and Excel, as well as the mobile apps for Excel, PowerPoint, and Word. Is this something that can be done?

If possible, I'd also like to adjust the default font for Teams and OneNote.