Checklist

• 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 2. Please use English, otherwise it will be closed.

Motivation

#3620
I would like to use the new deepseek template to force thinking. But I want that output to include also tag. This would be useful for eg in openwebui where it expects to find this tag.

Related resources

No response