WIO Terminal -Can Not locate board in Arduino v2.0.0-rc7

Just purchased a new Wio Terminal , it uses an ATSAMD51P19 processor but I can not find the b find the WIO Terminal or the processor in the board manager. I tried coping the info from the wiki but does not work. I need to a valid name to enter into the board to start up the Arduino IDE for programming. I have Arduino v2.0.0-rc7 IDE
thanks
Tom

In the Getting Started section: Get Started with Wio Terminal - Seeed Wiki it shows loading thee boards into the IDE with this file: https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json
Once that was done my Wio terminal showed up as it should.

John