Are you after a ternary plot?
There are open issues in plotting packages to support these maps. I know that TernaryPlots.jl had something working at some point:
Also, Zulip has a discussion with various more advanced tricks:
https://julialang.zulipchat.com/#narrow/stream/225542-helpdesk/topic/Can.20a.20recipe.20be.20used.20for.20ternary.20plots.3F
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