The best and likely also only way how you can export Visio smartshapes (.vss) as JPEG pictures (.jpg, .jpeg) would be to use Microsoft Vision. That is because Visio formats are almost never supported in 3rd party apps because the formats are proprietary.
Convert Microsoft Visio smartshapes data to JPEG bitmap image format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert vss to jpg on Windows
A vector based diagramming software from Microsoft
Convert from vss file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.