Inside Gravity Forms documentation , you can find out that you can pass data into Gravity Forms by using any of the following 3 methods: hooks, query strings and shortcodes. Let me show you how to pass data using filter hooks. Basically, what you’re looking for is gform_field_value_$parameter_name() filter. Note the $parameter_name.
Category: Gravity Forms
If using Gravity forms, It is likely that you will require columns sooner or later. The reason is simple - gravity forms are normally not used for simple contact forms, given their power and the fact that they are not free, so licenses for GF are being purchased by clients who know exactly what are they looking for.