LUA: Where can I find beam table?

I'd like to add some custom functionality in the beam table, more precisely I want to add a new case such as if "beam.breakGroup and beam.breakGroup ~= "" then" for example to put a tag in jbeam file above, let's say a front axle beams, so I could easily switch what to visualize. So where is that table? Maybe there is some other way of going around this? Any help is appreciated.

EDIT: Found out that it lies in v.data table, I'll try to look at it, anyway any suggestions are welcome.

 

Got it working nicely, ty sir