I just followed the installation tutorial: https://wiki.sipeed.com/hardware/en/tang/Tang-Nano-Doc/flash-in-linux.html
It detected my board correctly:
$ sudo openFPGALoader --detect
Jtag frequency : requested 6.00MHz -> real 6.00MHz
index 0:
idcode 0x81b
manufacturer Gowin
family GW2A
model GW2A(R)-18(C)
irlength 8
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