PostScan service like DeutschePost for letters delivered by Citipost?

I know that, Deutsche Post offers a PostScan service https://www.deutschepost.de/de/p/postscan.html where they can open letters, scan them and save files online for 15 euros/month.

But all the important letters from the tax office and migration office that I received by mail are sent by the company Citipost, which is not part of Deutsche Post.

I wonder if Citipost has the same PostScan service as Deutsche Post that I can subscribe to?

Does anyone have experience with this service from Citipost?

Thanks,