Add model group function.

[Aniwine]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I must to adjust every LLM single by single when I need to change model in a workflow application. Can add a model group function in model settings? In this way,I can adjust models of a workflow faster.Thanks

2. Additional context or comments

No response

3. Can you help us with this feature?

• [ ] I am interested in contributing to this feature.

[Yevanchen]

Could you describe the "dilemma" further?