You know that's not what's happening. The EU is withholding money because those countries have regressed democratically, with the executive controlling the judiciary and press, and oppressing the political opposition.
Plenty of conservative governments are in the EU. Freedom and democracy - which mean an independent judiciary and free and independent press - are not left-wing ideas!
Some 'values' like LGBT discrimination in Hungary are prohibited by EU directive: https://commission.europa.eu/strategy-and-policy/policies/ju...
So yes they are written down. And rightly so. Being conservative is fine but telling others how to live their life is not.
However this is indeed not the reason for the withdrawal of funds as others have mentioned.
But I'm referring to the withdrawal of cohesion funds from countries like Poland and Hungary under newly invented rules like needing to share "EU values". These values aren't defined or written down anywhere, but the only countries that seem to violate them are those with conservative parties in power. The moment the conservatives are no longer in power, suddenly the country is in compliance with "EU values" again.