How to get Len of a list in expression language

I want to get the Len of a list in expression binding but I can’t find any function for that.
Is it possible to do this by expression language?

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What do you mean with a “list”?

If you mean a dataset, the len() function just works like you’d expect. It counts the number of rows.


No I mean json array property in perspective.

This isn’t currently possible. It’s on our list to add general support for collections to expression operators.

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