New board extensions not supported by VSCode nRF extension?

Hello

When following the guidline of a new way to extend boards, VSCode "Add Build Configuration" is blank. Am I doing something wrong or this is not yet supported by nRF VSCode extension?

Attached is a sample project with the following "board.yaml":

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board:
extend: nrf52840dk
variants:
- name: test
qualifier: nrf52840
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extended_board_test.zip