You can only use Markdown and that‘s it, nothing else to be found, meaning no centering possible! I wouldn‘t want much, just to decide to left-align, center or right-align my stuff on my own and where to put it. I also asked about this on the peakd discord and their excuse was the comfort zone of new users and what their used to 🤦🏽 boring conservatives!
PS: Check out Markdown so you know what‘s possible … https://www.markdownguide.org