Google announced that the "Google Content API for Shopping," which is used to upload product data to Google, now exposes performance (click) data.
"This data informs merchants how often their products have been clicked on Google Shopping within any given time period," stated Thomas Kotzmann, Technical Lead, Content API for Shopping.
"The data is easy to grab by adding URL parameters to product retrieval requests, specifying the start and end dates for which performance data is required.
The returned product data contains new elements with the number of clicks per day for each product," added Kotzmann.
For more information, you can refer this documentation.