No, this is a known limitation and has already been reported to our product managers. If you are affected by this limitation and want to be updated about the status of this feature request, please send an mail to email@example.com or create a ticket in our Support Portal and reference the ticket number PM-1624
As workaround, you can use the Value Chain and the custom graphics (SVG).
For the Value Chain notation, the SVG are supported for the shapes "Process" and "Collapsed process". You can upload your SVG images for these shapes.
You can find more details on how to add custom graphics SVG in this article : https://documentation.signavio.com/suite/en-us/Content/process-manager/userguide/custom-graphics.htm