You can edit the "products" represented in the table and add "Ladybird" to the list. [1]

Their result is: 1974740 / 2152733 (91%)

They also have their own dashboards tracking this [2]

[1] https://wpt.fyi/results/?product=ladybird

[2] https://grafana.app.ladybird.org/public-dashboards/2365098a1...