You can only convert virtual machines as whole, not only few files from it. So unless you got all the relevant virtual machine files like disk images, configurations etc. you are unable to convert just the lone VMX to PVS. With all the files, it should not be a problem.
Convert VMware configuration data to Parallels configuration data.
We have found 3 software records in our database eligible for .vmx to .pvs file format conversion.
Microsoft Windows software - convert vmx to pvs on Windows
A virtualizing solution for small businesses and professionals
Convert from vmx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned vmx to pvs. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert vmx to pvs on OS X
Mac version of the popular virtualization software
Linux/Unix software - convert vmx to pvs on Linux
Virtualizing software for Linux operating system.