Google has not released any information regarding whether or not structured data is a ranking factor. However, there are some indications that it may be used as a signal. For example, Google has said that they use structured data to understand the content of a page. In addition, they have also said that structured data can help them determine the relevancy of a page for a given query.
While there is no definitive proof that structured data is a ranking factor, it is definitely something that can help your page stand out in the search results. If you have relevant and well-structured data on your page, it is more likely that Google will be able to understand the content of your page and determine that it is relevant for a given query. In addition, having structured data can help you get rich snippets in the search results, which can also help your click-through rate.