Dear Diego
I also struggled to find some code example using TTable objects. I guess one has to try it and follow the Doxygen to see whether it works fine for you .
Alternatively if you work within a python environment I would suggest to try one of the many packages for table printing , I usually use PrettyTable module or if you want to deal with latex directly you might want to look up pylatex.
Within c++ you can also find several tables c++ implementation. Among the ones I found , I guess the single header one from GitHub - p-ranav/tabulate: Table Maker for Modern C++ looks quite nice.
I hope this is what you meant by using tables in ROOT. I am not aware of direct conversion of histograms to tables, you can however navigate the histogram content and produce a nicely printed table with any external class or custom code.
Cheers
Renato