Samsung Galaxy Tab S10 Series (SM-X82XX / X92XX) has finally got TWRP, a type of custom recovery that would help you install 3rd party ROMs.
Orange Fox released a beta version of TWRP for Samsung Galaxy Tab S10, S10 Plus and S10 Ultra. FE variants are not supported. Keep in mind that once you flash TWRP, warranty would no longer be applicable.
However, it is totally possible to get warranty back by flashing latest stock ROM which will also flash stock custom recovery, replacing the TWRP, thus giving you back your warranty.
Here are step-by-step instructions on how to flash TWRP on Galaxy Tab S10.
Download this file containing TWRP on your computer. Save files to the Tab S10’s internal storage.
Turn off the Tab S10 and reboot into TWRP Recovery via the combo Tablet Off + USB TYPE C cable connected to PC + Power Off Button + Volume Up Button.
Once TWRP is loaded, press Install. Find the downloaded file.
Once finished return to the TWRP main menu and at the end go to the advanced restart menu of TWRP and restart in Recovery mod.
Orange Fox should be loaded. You can now reboot to the System.