It is not possible to strictly use the Grafcet standard in AutomationView. However, we use an SFC (Sequential Function Chart) interpretation called Sequence (.seq files) which is very similar to Grafcet.
Using the User Interface (Button):
Right-click in the File Explorer and click New Sequence.... Once the file opens, look at the top right of the editor title bar and click the Open Visual Editor button. This gives you a drag-and-drop interface where you can add Steps, Transitions, and Actions.
Using the Command Palette:
It is also possible via the Command Palette: