Goal

Have a clear premade/group indicator in the scoreboard and game loading screen, so there is transparency of which players are playing in premade

Benefits

Instantly see which players are grouped, which allow you to:

• See if the game is balanced in terms of groups
• Which players of your team will work more together (if the jungle, ADC and support are premade, probably you know that as an offlaner you are going to receive less help)
• Which enemies you have to take care from
• Allow players to detect when they are receiving “group toxicity” (when players in a group become toxic together)

Example of how Overwatch handled it:

Predecessor could do something similar to what Heroes of the Storm did, adding a "group icon" next to the hero: