Array variable in G-code

Hello folks! I am wondering about is there any way to define an array variable in G-code? The main reason makes me wanna know this is about aligning columns in my log file. I am doing some repeated measurement operations in forward and reverse way. During this process, if i log the data one after another, rows are being increased in my log file, and i need to arrange that file to align forward and reverse measurements in excel by myself. I think keeping the data in the array can be solution. 

Thank you for your time,
Berkay

Thank you for your answer Andy.
Is there any discord channel or something like that to discuss these kind of topics? It would be great if i can join that channel.