How to set a template in ConversationalRetrievalChain? There is no suitable variable to use in the code anymore

[DennisPeeters]

Hi,

I cannot set a "template" variable in the chain. And indeed when looking at the source code (https://github.com/hwchase17/langchain/blob/master/langchain/chains/conversational_retrieval/base.py)

There is no suitable variable for "template" anymore.

Trying to add the template variable myself off course leads to the error: "ValidationError: 1 validation error for ConversationalRetrievalChain template extra fields not permitted (type=value_error.extra)"

Any idea where my thinking is wrong?