Format the text output of so.Text()

[FirefoxMetzger]

Is it possible to apply post-processing to the value displayed by so.Text()? I want to create a "top 5 vs. bottom 5" style plot and my naive attempt is looking a bit odd:

I would like to do two things:

1. Format the value of text to something like f"{text:.2%}"
2. set halign to "right" if its position is above some threshold so that it appears inside the bar instead of being clipped.

Sidenote: I am a big fan of the flexibility of the objects API 🚀 though I must admit I haven't fully understood the intuition behind it yet, so it could very well be that this feature exists and that I just missed it in the docs because I've searched the wrong places.

[mwaskom]

Here's what I would do right now

df = sns.load_dataset("glue").groupby("Model")[["Score"]].mean()
(
    so.Plot(
        df,
        x="Score",
        y="Model",
        text=df["Score"].round(1),
        halign=df["Score"] > 70,
    )
    .add(so.Bar())
    .add(so.Text(), color=df["Score"] > 70)
    .scale(color=["b", "w"])
)

I think that some aspects of this will get cleaner with #3107, e.g. instead of halign=df["Score"] > 70 you would have halign=lambda: "Score > 70". and instead of text=df["Score"].round(1) you'd have text=lambda: "Score.round(1)".

Format is a little trickier and I wouldn't say I'm against having a format property for the text mark, but there are enough annoying open questions (what is the default? how does the mapping work?) that I'm holding off for now.