CSPP Integration: Can a Timer Be Implemented as a Word/Excel Add‑in?

Hi everyone,

I’m currently integrating Microsoft Word and Excel into our platform and making sure we follow all the recommended UI guidelines. In our solution, we use an internal timer component that runs while users are working inside our product(I mean the timer shows total time left for their tasks something like this).

I’m trying to understand whether this timer can be built or installed as an Office Add‑in for Word and Excel. Would implementing it as an add‑in still align with Microsoft’s UI guidelines?

Any guidance or clarification would be really helpful.
Thanks!