No, as foreign work experience for a spouse doesn't gain you any CRS Score points, you don't need to provide proof of it - however if you already included it in your EEP, once you get an ITA, you would have to remove it from the 'Work Experience' section of the electronic application for permanent residency (eAPR) questionnaire and move it to the 'Personal History' section, as it still needs to be reported. If you keep it in the 'Work Experience' section, the eAPR will automatically ask you for proof, even though you don't actually need to provide it.