Specify a choice per label per video frame

**Is your feature request related to a problem? Please describe.**
I want to label videos of emergency vehicles and draw 2D boxes for each frame they are present, classify the type of vehicle, and then select a choice of whether the vehicle's emergency lights are flashing or not.

Right now I don't see a way to specify a choice per rectangle that allows me to change the choice selection per frame.

Here is my template:
```

```

**Describe the solution you'd like**
Allow specifying choices per 2D rectangle per video frame.

**Describe alternatives you've considered**
I tried modifying the template to support this but had no luck.

**Additional context**
Attached is a video showing how changing the choice selection at one frame will change for all frames.

https://github.com/user-attachments/assets/320a3764-14c5-43b5-a3a2-f83f4c93a9f4