How get array length withoutgetfull array?

I need to get the number of subscribers in a group. How can I do this? The list of subscribers is obtained on the client side, and I don't want to overload it with a large amount of information just for the sake of length. I'm using Next.js and Appwrite cloud

TL;DR

Developers want to find the length of an array without loading the full array on the client side to avoid overloading. They are using Next.js and Appwrite cloud.