Although there are plugins that let u export into CMYK printable PDFs, Figma will not let you modify its colors.
Also, as to date, CMYK mode not available in Figma.
Recommended tools:
- Photoshop
- Illustrator
- InDesign
Quick note: if you ever want to save the file as JPG or PNG, please use "Export as" option, and then make sure to check off the "Convert to sRGB" option before exporting.