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To insert y-axis labels into a coord_polar chart in ggplot, you can use the following code:

ggplot(data, aes(x = x_variable, y = y_variable)) +
  geom_bar(stat = "identity") +
  coord_polar(theta = "y") +
  labs(y = "Label for y-axis")

In this code, replace "data" with the name of your dataset, "xvariable" with the name of the variable you want to plot on the x-axis, and "yvariable" with the name of the variable you want to plot on the y-axis. Then, replace "Label for y-axis" with the label you want to use for the y-axis.

Note that in a polar coordinate plot, the y-axis label corresponds to the radius, or distance from the center of the plot.