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No. Then JunOS adapter does not currently support the OS Image snapshot action.
The Caveat to this statement is the device adapters can be customized so if you want you can try to modify the adapter to add that functionality yourself.
In the Device Adapter Notes we indicate the reason we did not include this action originally, was it was not possible to snapshot the OS image in JunOS at the time of the adapter development. If that is no longer true then you could go the customization route.
Here is the section of the documentation for Adapter development: