I just can't believe how easy it was actually...
Here is the shared project : https://fxdreema.com/shared/vauFi9zNd

You just have to call the "TesterStatistics(STAT_whatever needed)" and store in a variable then put it in your write to file.
This is a big game changer for me and I hope it would help others !
I put the topic on solved.
BONUS : If like me you think that 10 columns in write file isn't enough, use a custom block to put all your constants & variables in a string separated with a comma (like this)

Then in Excel use the "convert" option :
Highlight the column that contains your list.
Go to Data > Text to Columns.
Choose Delimited. Click Next.
Choose Comma. Click Next.
Choose General or Text, whichever you prefer.
Leave Destination as is, or choose another column. Click Finish.
