Parameter-vmTemplate.json

 },
    vmTemplate": {
      value": "{\"domain\":\"alven.local\",
        \"galleryImageOffer\":null,
        \"galleryImagePublisher\":null,
        \"galleryImageSKU\":null,
        \"imageType\":\"CustomImage\",
        \"imageUri\":null,
        \"customImageId\":\"/subscriptions/SUBID-123123-123123123--123123123-123123/resourceGroups/wvd-rg/providers/Microsoft.Compute/galleries/alvenSIG/images/win10Svrimages\"
        ,\"namePrefix\":\"wvd\"
        ,\"osDiskType\":\"StandardSSD_LRS\"
        ,\"useManagedDisks\":true
        ,\"vmSize\":{\"id\":\"Standard_D2s_v3\",\"cores\":2,\"ram\":8}
        ,\"galleryItemId\":null}  
},