When will command line for building Variable Fonts be added?

[weiweihuanghuang]

Prerequisites

• [x] If you are reporting an issue that affects glyphs for characters for a particular region or regions, did you verify that the characters are within the supported scope of the region or regions? This generally means GB 18030 or Tōngyòng Guīfàn Hànzìbiǎo (通用规范汉字表) for China, Big Five or CNS 11643 Planes 1 & 2 for Taiwan, HKSCS-2016 for Hong Kong, JIS X 0208, JIS X 0212, and JIS X 0213 for Japan, and KS X 1001 and KS X 1002 for Korea.
• [x] Did you thoroughly search the open and closed issues to avoid reporting a duplicate issue?
• [x] Did you go through the official font readme file to better understand the scope of the project, to include the Known Issues section at the very end?

Description

COMMANDS.txt still states Command line for building Variable Fonts will be added soon. Any word on when that might be added?

[punchcutter]

Serif was updated a long time ago to add this info in https://github.com/adobe-fonts/source-han-serif/tree/master/build Sans is pretty much the same, but I haven't added those files yet.