ArcGIS Pro 3.0.2: Which variable in the model builder can be used to pass a value for the “expression” of the “field calculator”?

[JamalNUMAN]

ArcGIS Pro 3.0.2: Which variable in the model builder can be used to pass a value for the “expression” of the “field calculator”?

For example, in the screenshot below, I couldn’t figure out which variable in the model builder can be used to pass a value for the “expression” of the “field calculator”

[ammsgis]

Hi Jamal, how you doing man?
What are you wanna do? If you intention is change the field  you can use the  function replace in the helpers.
Let me know if I understood wrong.