Both .cch and .cdr files come from CorelDRAW, so it's safe to assume if any kind of cch to cdr conversion or similar export is possible, it would be done with this software. CCH format is used to store charts, which means that this most likely covers import of charts to new or existing CorelDRAW files.
We have not found any specific information about this particular conversion, but if you struggle with it or face some other issues, it might be best to reach out to either Corel support or perhaps CorelDRAW online community.