There does exist software called digitizer, that can create embroidery format, such as the EMB, from a JPG picture. For example Janome Digitizer can create its JEF embroideries from JPG sources, and these can then be converted to EMB using one of the JEF to EMB converters.
Convert JPEG bitmap image format to Embroidery design file.
We found one software available in the database for this conversion.
Articles and other information relating to jpg into emb conversion:
How to create embroidery design from a photo or picture - Embroidery digitizing function
Microsoft Windows software - convert jpg to emb on Windows
An easy embroidery and apparel decoration design software
Convert from jpg 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.