Nope. But you can import images and use them:
- First copypaste the signature in paint.net for instance and store it locally on your laptop.
- Then in your Mendix app add an ImageCollection in the Project Explorer view. Open the Image Collection and add your image.
- Then on a page add the widget ‘Image’ and select the signature-image.
If you want the user herself to be able to insert the signature, then use the widget ‘Upload Image’ for that.
Also, do check out the two Signature-apps in the appstore. They allow the user to sign on any touchscreen, usually a phone.