@items.length should do the trick
How to count the items from a relation field?
Please help us. We need to count the number of items from a related field with a calculated field. This is what we have. Thank you for the help!
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@All of Numero.length
The function length counts the related items. I took the field Numero cause that's the only field I could see in related items, you can reference any other field from the related app, e.g. @All of Title (where Title must be the label of the field).