Unable to pass an evaluation criteria to a SimpleCriteriaScore

[vklonin]

[ X] I have checked the documentation and related resources and couldn't resolve my bug.

Describe the bug
Unable to pass an evaluation criteria to a SimpleCriteriaScore

Ragas version: 0.2.8
Python version: 3.12

Expected behavior
I want to set up my own simple validation in SimpleCriteriaScore but I am unable to, because in a code it is rewrited with some hardcoded validation criteria

self._definition = definition
self.single_turn_prompt = single_turn_prompt or SingleTurnSimpleCriteriaPrompt() - i may pass my instruction here
self.multi_turn_prompt = multi_turn_prompt or MultiTurnSimpleCriteriaPrompt() - i may pass my instruction here

update the instruction for the prompts with the definition
instruction = f"Evaluate the Input based on the criterial defined. Give a score between 0 and 5.\nCriteria Definition: {self._definition}"
self.single_turn_prompt.instruction = instruction
self.multi_turn_prompt.instruction = instruction

I also may pass my instruction in definition but it is also not working because of this instruction = f"Evaluate...