I’ve been advocating for this for quite some time — you can see me on this very thread in 2021… Let’s not lose hope: one of my feature requests from 2016 or early 2017 has been implemented in Dorico 5.1 
You can also use Gofigure font (created by @benwiggy and @fkretlow ) — this font used to be Figurato before the Team implemented Figured Bass, and now I’d say the only reason you’d want to use it is because it allows you to input that French-style figures.
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