Pythonでシングルクオートなjsonを読み込む

import json

raw = "{'comment':'hello'}"
j = json.loads(raw)
print(j)

# json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

import ast

raw = "{'comment':'test comment'}"
j = ast.literal_eval(raw)
print(j)

# {'comment': 'test comment'}