[Python] How to add a different label or different value to plot title, per facet

I need to add an R-squared value to each facet of the facet grid or facet wrap of Python's letsplot plotting library.

So far I can't figure a way to do it, nor does it seems that there is a way to iterate over the plot object, g, in this case, in order to add labels or alter titles, per facet, or perhaps I am missing something?

In this example, how do I add different labels or/and different values to titles:

import pandas as pd
import numpy as np
from lets_plot import *
LetsPlot.setup_html()
import seaborn as sns

pengu = sns.load_dataset('penguins').dropna()
g = (
ggplot(pengu, aes(x = 'body_mass_g', y = 'bill_length_mm',))
+ geom_point(aes(color = 'species'))

# + geom_smooth(aes(color='species'))
+ geom_smooth(aes())


+ ggmarginal('tr',layer=geom_density())
+ ggmarginal('tr',layer=geom_histogram( aes(fill='species'),alpha = 0.25, size = 0.25))
+ ggmarginal('bl', size = 0.05, layer=geom_boxplot(aes(color = 'species'),size = 0.4,))

+ facet_wrap(facets=['sex','island',], format = '{d} \nhow to add different text per plot?\nI need an R^2 value here')
+ labs(title='A facet grid of penguins', subtitle='colorful penguins', caption='caption' )

+ geom_label(x=4500, y=58, label='How to put different label \nper facet?', size=10)
+ xlab('body_mass_g') + ylab('bill_length_mm')
+ ggsize(1500,1000)
+ theme_bw()
)
g


This is the plot I am talking about:



I've tried looking at the methods of the plot object, g, but I couldn't find a way to alter it so the values would change, but I am by far no expert on those matters and I would appreciate some help.

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