How do I change the fill of individual circles in ggforce::geom_circle to custom hex code colors?

For the following geom_circle() example:

library(ggplot2)
library(ggforce)
circles <- data.frame(
  x0 = rep(1:3, 3),
  y0 = rep(1:3, each = 3),
  r = seq(0.1, 1, length.out = 9)
)

plt <- ggplot() +
  geom_circle(aes(x0 = x0, y0 = y0, r = r), data = circles)
plt

It correctly produces the following plot:

I wanted to fill the individual circles based on a vector of hex codes, for example colors <- rep("#00FF00",9)

However, when trying to manipulate the coloring with the following code:

colors <- rep("#00FF00",9)
ggplot() +
   geom_circle(aes(x0 = x0, y0 = y0, r = r), fill = colors, data = circles)

It produces the following error:

Error in `geom_circle()`:
! Problem while setting up geom aesthetics.
ℹ Error occurred in the 1st layer.
Caused by error in `check_aesthetics()`:
! Aesthetics must be either length 1 or the same as the data (3249)
✖ Fix the following mappings: `fill`

The number of circles is clearly 9, so I'm assuming that the actual geom_circle() transforms the input into a bunch of smaller datapoints or something like that. In any case, how would one go about transforming the colors individually? A potential solution is to iteratively add each circle individually but in my usecase there are thousands of circles that need to be added.

One option would be to add you colors as a column to your dataset which could be mapped on the fill aes and by adding scale_fill_identity.

library(ggplot2)
library(ggforce)

circles$colors <- rep("#00FF00", 9)

ggplot() +
  geom_circle(aes(x0 = x0, y0 = y0, r = r, fill = colors), data = circles) +
  scale_fill_identity() +
  coord_fixed()