DevTest Labs now supports integration with Azure Shared Image Gallery (SIG).
For the scenario you outlined above,
You can extract the images for the VMs you would like to move to a lab
Upload these images to the shared image gallery
Attach the shared image gallery to your lab
Create lab VMs from these images
Upload images to a SIG: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/shared-images-portal
Attach a SIG to a lab: https://docs.microsoft.com/en-us/azure/lab-services/configure-shared-image-gallery
Create a lab VM from a SIG image: https://docs.microsoft.com/en-us/azure/lab-services/add-vm-use-shared-image
An error occurred while saving the commentPablo commented
Any news in this feature?