After a bit of confused poking around, I finally succeeded to get a working seed configuration in the Arduino IDE platform.
I’m on OS X 10.15 Catalina, but I presume that the procedrues are the same on both Windows X and OS X 10.16 - Big Sur.
After adding the board in the preferrences via the the following link to the "Additional Boards Managers URLs " field: https://github.com/stm32duino/BoardManagerFiles/raw/master/package_stmicroelectronics_index.json
I selected the Generic STM32H Series and then Daisy Seed, using STM32Cubeprogrammer (DFU) as upload method
I attached some pictures for clarity
Have fun, Brock