Feature Request: Support node_properties/relationship_properties in LLMGraphTransformer for LLMs without native function calling

[dhiaaeddine16]

The LLMGraphTransformer class currently blocks usage of node_properties and relationship_properties parameters when using LLMs that lack native function calling capabilities. This restriction forces users to choose between:

• Using lightweight/OSS LLMs without structured property enforcement, or
• Requiring expensive/closed models with function calling support.