Get Group Rolls

[Jooze]

Let's say i'm in a normal heroic group and we have group roll enabled.
An epic drops, I get it's rollID and with that also the item name and additional information with

local texture, name, count, quality, bindOnPickUp = GetLootRollItemInfo(GroupLootFrame1.rollID);

But now I want to get the rolls all players (us 5 in that heroic group) have made and list them in a Font String.

How would I get the other players rolls? Would I have to intercept the chat frame (with someframe:RegisterEvent("CHAT_MSG_CHANNEL") for example) and how would I scan the chat for rolls?