Global Modifiers on Stat Blocks - DnD 5e

Is it possible to add a global modifier field to a creature stat block, or do I just have to make a regular character sheet?  I have a barbarian druid, and would like to add a rage toggle to my wildshapes.

One option is to toggle rage on your main character sheet, then reference that in the damage sections of your creature NPC sheets. If your MoonBarb was called Bob, and Rage was the first damage modifier in the globals section, you could add this to the damage field of your wildshape NPC attacks: + [[@{bob|repeating_damagemod_$0_global_damage_active_flag} * @{bob|repeating_damagemod_$0_global_damage_damage}]][Rage]