Add jinja2 format of prompt template for LangSmith Prompt Playground

[Undertone0809]

Checked

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Feature request

Add jinja2 format of prompt template for LangSmith Prompt Playground. We can provide a optional button to choose prompt format. {var} or {{var}}

Motivation

The current prompt template does not support the jinja2 format. If there is some JSON data in the prompt, it may not generate variables as expected.

Proposal (If applicable)

Add a button to choose prompt format as follows:

[arne-rustad]

Any progress here?