It appears that you can import an DXF files to Canvas drawing software, so it should be possible to convert dxf to cnv files (Canvas native drawing format) just fine. Unfortunately, it does not seem to be possible to achieve dxf to cnv conversion by other means.
Convert AutoCAD DXF Drawing Exchange Format to Canvas drawing.
We found one software available in the database for this conversion.
Microsoft Windows software - convert dxf to cnv on Windows
A drawing software used to create technical illustrations and graphics
Convert from dxf 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.