CorelDRAW supports jpg image format and you can import it to the program as an graphic object or transform bitmap jpg image into vectors.
If you want to transform and convert bitmap jpg graphic to Corel vector graphics there is a special function in Corel Draw called Corel Power Trace which can be used to convert bitmap graphics to vector and thus saved as cdr format.
This function is accessible through the Raster ► Convert to Raster menu option when you have selected the object (imported .jpg image).
In previous versions of CorelDRAW Graphics Suite it was a standalone application called Corel Power Trace, but in newer versions it was integrated into CorelDRAW program as a function.
CorelDRAW is not available for macOS platform, so if you do not have access desktop PC with Windows you would need to install it in virtual machine - probably not the cheapest solution.
As for online converters, CDR format is proprietary and closed, meaning there won't be any websites capable of jpg to cdr conversion available. And if you by a chance find some, it will not save in the latest variant of CDR format.
Updated: December 8, 2016