There are several Dynamics 365 Connector Macros available to be used in Connect.  You may view a listing of the available macros by clicking on the link "Click here for examples" in the Connector Process setup menu.

When setting up a form for integration, you can map to a field from your Kentico form to a Dynamics field, or you can choose to push a "static value" to the CRM field (static values will allow you to use K# Macros).