Can you give some more information around what you are asking for?
The only process group properties I am aware of that refer to the container are around the container name ie "Docker Container Name". I am not aware of a Process Group Property in PG naming rules that specifies the container ID.
I was also looking for information on this, and my search lead me to this old unanswered question.
Container ID I believe is a unique identifier for the container, basically just a very long unintelligible string. But the property "Container" is a bit unclear to me. When looking at a container's properties, I see:
All of them have different values. So which of them is "Container", if any? There is no property named just "Container".
Having investigated this a bit more, it looks like Process Group displays "Container". And Process Group Instance displays "Container name". So essentially Container == Container name? Maybe just an oversight..?