Creating Lead Source Rule

Creating Lead Source Rule

Hello helpers,

I'd like to create a rule within ZohoCRM.  We use the field "Lead Source" to track where our sales leads come from.  Google search does not automatically populate this field.  However, we do pass UTM_Source/Medium into Zoho.

I'd like to setup a rule such that IF "UTM_Source"=Google, THEN "Lead Source" = Google

Not sure how or even if this can be done.