How to create ''3bet ai'' and ''3bet nai''.

[OneKef]

Hi, I'm a bit rusty.
Help me create a stat for ''3bet ai'' and ''3bet nai'' please.
For mtt, so on open standard 2/3x count the 3bets from 2.5x+...at the moment I don't even know how to insert the stack values ​​:(
I also checked maybe old posts but anyway, I can't make columns/strings work anymore and I don't know where to start.
Thank you so much.

[Flag_Hippo]

There is an example of that type of statistic in this thread.