I'm aware I must be creating a different stat for that, as stated in:
"#Sample size of "Went to Shodown" stat
Cases(Flop Any Action)
This is an example of a stat that shows sample size for an expression stat. Hand2Note doesn't calculate sample on expression stats by default. So if you want to see sample size for an expression stat in your HUD or popup, you need to create a separate expression stat for that."
But I think it really wasn't clear on how to do it.
Im aware of the process so I think it's probably a simple solution.