Google Ads has announced that store campaigns will now also receive an optimization score. Google said, "We recently extended the score with Shopping campaigns – in addition to Search campaigns – to make more real-time recommendations for improving overall account performance."
Here is a screenshot:
Google explained that, just as for search network campaigns, the optimization score for Shopping campaigns ranges from 0% to 100%, where 100% means that your campaigns are set to perform optimally. You see separate scores for search and shopping at the campaign level and one combined score at the account level.
You can learn more here.
Forum discussion on Google Ads Help.