A few even have experience working with the United Nations.(https://ludwig.guru/s/experience+working+with) (https://www.forbes.com/1999/09/13/freeman_0913.html#338ea1d5720f)
I have experience going to England.
It seems like "working with the United Nations" actually modifies "experience".
So, I think that it could be parsed as "Experience is working with the United Nations".
If my thinking is correct, could you please bring me some sentences like this?