Is it possible to do bulk read from redis outside index block in Ruby ActiveAdmin?

I have code within index block, where if there are X users for a class, the index block is looped X times.

Within index block, I make a call to Redis to read a value. So, it would be X calls to Redis.

1. Is there a way to make bulk call to Redis where we can pass X users' ids as an array? (Say GetBulkUserNames(<Array_Of_X_Users_Ids>) ) If yes, how to do that? Should that go in a method or it can be anywhere outside the index block?

2. How can we get X users' id within ActiveAdmin.register so that we can pass it to GetBulkUserNames() ?