You have to install the VMware ovf-tool (https://code.vmware.com/web/tool/4.4.0/ovf) to your workstation.
- export the vm to an ovf-file
ovftool vi://root@${esxserver}/${vm-name} .
2. you have to import the ovf-file to your proxmox
qm importovf ${new-vmid} ${ovf-file} ${target-storage}