As of July 2022, GA4 bounce rate does exist. But it's a very different metric from UA. Let's compare the two bounce rate metrics.
GA4 vs Universal Analytics
How to Track Bounce Rate in Google Analytics 4 (GA4) - AgencyAnalytics
GA4] Engagement rate and bounce rate - Analytics Help
Key Differences Between GA3 and Google Analytics 4 - Ruler Analytics
Google Analytics 4 (GA4) vs Universal Analytics: Key Differences
GA4 vs. Universal Analytics [+ Free Comparison Template]
UA vs GA4: Metrics Comparison Guide
GA4 Bounce Rate vs UA: What's the Difference?
GA4 Link Click Tracking Track Internal and External Link Clicks
GA4 vs Universal Analytics: The Key Differences
GA4 Views and Filters: Creating Views in Google Analytics 4
UA vs GA4: A Complete Tour of Google Analytics 4
Google Analytics 4 vs. Universal Analytics: Comparing Metrics