Better mustache/jinja support in langfuse playground

[FlorDonnaSanders]

Describe the feature or potential improvement

I noticed support for mustache variables detection in the langfuse UI is currently quite limited.
E.g. For a conditional variable statement like this

{{#some_variable}}It exists: {{.}}{{/some_variable}}

The variable some_variable is not listed in the UI and not usable in the playground.

It would be nice if full mustache syntax is properly supported everywhere.

Additional information

No response

[marcklingen]

I agree that this would be cool! I saw other teams using Jinja to incorporate loops and conditional logic in their prompts.

[marcklingen]

I updated the title to include jinja as well

[DannyGsGit]

+1 vote, my team has been using a lot of conditional prompts with Jinja templates. We have a hacky way of using these templates through Langfuse today (our own prompt compile), but it would be amazing if we could set Jinja templating engine in compile().