Although there may not be any built-in driver blocks to control a stepper motor, there is a File Exchange submission which may be useful:
This has blocks to control stepper direction and stepper speed. A limitation is that these blocks are compatible only with Adafruit Motor Shield V2, you can find the link to Adafruit Motor Shield here:
The File Exchange submission contains a PDF document as well as a video, which explains how exactly these blocks can be used. It also has an example model that explains the workflow and the required connections.
