Android 12 Beta 2 appears to have revealed details about the Pixel 6 and Pixel 6 Pro's wireless charging capabilities. According to a report, Google has added support for a wireless charger with a fan, implying that the Pixel 6 and Pixel 6 Pro will support more than the 10 W to which Google restricts the Pixel 3, Pixel 4 and Pixel 5 series.
https://www.notebookcheck.net/The-Google-Pixel-6-and-Pixel-6-Pro-may-support-high-wattage-wireless-charging.545589.0.html