How to add a title to an existing plot?

The following works for me

julia> using StatsPlots

julia> plot(; title = "Test")

julia> boxplot!([1,2,3], label="a")

julia> boxplot!([1,2,3], label="a")
pkg> st StatsPlots Plots
Status `~/.julia/environments/plots1.0/Project.toml`
  [91a5bcdd] Plots v1.35.4
  [f3b207a7] StatsPlots v0.15.4
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