Points & Team Scoring: Loop X that has flag, then update Y with same flag.

Hello, I am making a team sport-like game. I am trying to get my head around scoring. I think the below information describes the scenario.

Data & Entity Structure:
EntityA
- Component: Score { int Value }
- Component: TeamRedFlag
- Exists as part of round initialization.

EntityB, C, D, E...
- Component: ScorePoint { int Value }
- Component: TeamRedFlag
- Created during play when a goal is reached.

I am not currently storing Entity references or buffers.
TeamRedFlag is IComponentData { bool Flag }, not SharedComponent, and not Tag.

Desired Outcome:
For Team Red, Score.Value = Sum(ScorePoint.Value)

In other words, each frame I want to process all the scorepoints and calculate the score for that team, store it in Score, then destroy the scorepoint. I will also calculate Blue team, but I'm fine with duplicate code/hardcoded teams for now.

What I've tried:
I could probably figure this out without Jobs, but I've tried to avoid Entities.ForEach in OnUpdate because in my early ECS scripts - for other features - I used nested ForEaches and I think it was pretty terrible.
These same early features used SharedComponentData, but I've also avoided these too. When I used them, I found their pattern of usage either really helpful (SetFilter) or unhelpful (unable to use them like I do with components).
I tried using the Boids as a reference for using data from one job in another, but the sample is just too complex to make sense of. I think there's a need to store data in a third place, but I'm just not sure how, when or where.
I tried providing the job with ComponentDataFromEntity and NativeArray in various combinations. I had trouble setting data in the end.

So right now my Job is just empty. I really don't know how to do this.

I am open to structural changes if you're certain it'll work

Thanks for your help.

EDIT: I think this is related to 2 other recent threads.
https://forum.unity.com/threads/cycle-in-a-cycle-by-means-of-dots.707372/
https://forum.unity.com/threads/how...ueue-from-one-parallel-job-to-another.710393/

 

Entities.ForEach<Score>
IJobForEach<ScorePoint>.Run()

Write your result to a NativeArray of size 1. That should get you at least working. You can optimize later. But really, TagComponents would simplify the problem quite a bit.