How to implement own UI widget in libGDX?

I want to implement my own widget, here is an image:

what I want to get. Instead of numbers there will be some names, but I think it doesn’t matter. I’m pretty new in libGDX, so could you please briefly describe me plan, how can I do something like this (if there will be some code, it would be awesome)? I tried to google it, but didn’t find something relevant.

Thanks in advance!