A new leak suggests that Samsung's upcoming Exynos 1000 and Exynos 2000 series SoC could come with an AMD Radeon GPU. They are likely to be launched in Q2 or Q3 2021, presumably alongside the Samsung Galaxy Note 21 or Galaxy Z Fold 3. Another forum post says that the Radeon-branded GPU manages to outperform the A14 Bionic.
https://www.notebookcheck.net/Leak-suggests-that-AMD-and-Samsung-s-Radeon-mobile-GPU-could-be-launched-sometime-in-Q2-or-Q3-2021.516872.0.html