[Flutter] Flutterflow: generating Id values

Using Flutterflow I want to auto generate an Id in when creating a firebase document. Here is an example:

create new document in collection "fruits".

name: "Apple"
fruitID: "yTMG0dDUGHDpyqjegU3i"
where the document reference is "/fruits/yTMG0dDUGHDpyqjegU3i"​

My question is, what variable to set in the fruitID field to achieve this. Or ist there a function that can do that?

Thanks!

I tried to find a solution via a custom function, but I could not implement it in the document creation UI. Also there was no reference link available.

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