Generally speaking, no. But a very crude heuristic could be the incidence of proper names: more proper nouns, more is its misinformation propensity. More adject

Generally speaking, no. But a very crude heuristic could be the incidence of proper names: more proper nouns, more is its misinformation propensity. More adjectives/adverbs, more opinionated. A very bad heuristic, but a heuristic nonetheless.