I have

and want the blue label to be hidden, since it’s too small and gets overlapped by the purple one.

    test = (
        p9.ggplot(df, p9.aes('col1', fill='col2'))
        + p9.geom_bar()
        + p9.geom_label(
              p9.aes(
                  label=p9.after_stat(
                      'combine(count, count / sum(count) * 100)'
                  ),
                  color='col2'
              ),
              stat='count',
              position='stack',
              show_legend=False,
              boxstyle='square',
              boxcolor='black',
              size=7
          )

I tried

    def combine(counts: pd.Series, percentages: pd.Series):
        fmt = "{} ({}%)".format
        cmax = max(counts)
        return [
            fmt(c, p) if c > (0.1 * cmax) else None
            for c, p
            in zip(counts, percentages, strict=True)
        ]

to no avail.