How to use Obsidian at work where installing it is not allowed?

I recently began exploring Obsidian. I ended up liking it so much that I went with 1-year subscription straight ahead. But now I remembered that this app works on local-only basis. But I am not allowed to install anything on my office laptop. How then can I use some extra time in office for both reading notes in my vault and writing to my vault while studying in spare time? If that's totally impossible, isn't that a limitation of the app?