Copy WeKan board JSON to clipboard
sudo apt install xclip
cat board.json | xclip -se c
At some Chromium-based browser, click right top your username / All Boards / New Board / From Previous Export.
At input field, right click / Paste as Text.
Click Import.
sqlite3 wekan.db
.mode json
.load wekan-export-board.json board
To be continued