The simple answer: No (but we do have a solution) Google Analytics 4 stores data in a completely different format which makes it impossible to migrate data of Universal Analytics (GA3) to GA4. Hence, we recommend running both versions GA3 and GA4 alongside each other for a while and start building up as much historical data in GA4 as you can. This can be done by dual-tagging all pages of your website with both Universal Analytics and Google Analytics 4.