You are correct that the pca function does not have an option to plot directly, and you do need to take the output and then plot it.
You are also correct that to get a scree plot like the one you attached, the easiest way is just plot the explained output from pca.
To get the other graph, that you included as an image, you probably want to use the histogram function on the score output. If you want three sets of axes in one figure, as shown, then I'd suggest the tiledlayout function.
