Plot group size after running groupby

I have a DataFrame with a :group column and did a
gb = groupby(df, :group)

I would like to plot the group sizes vs. group id.
For example, for group gb[1] on the x-axis I would like to plot nrow(gb[1]) on the y-axis

How can I do it?

gb = combine(groupby(df, :group), nrow => :n)
scatter(, gb.n)

Requires DataFrames and Plots

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