How to use volumeTexture4sampleANIMATED node

Hi,
I’ve found a video on Unreal Engine’s YouTube channel which explains the creation of volumetric VFX, in this video they use a node called " volumeTexture4sampleANIMATED ", I want to know how to access this function because I couldn’t find It on my own and furthermore how to use It if there are any tutorials for It, and also is there a way so I can create It myself?
thanks
Here is the video