How to format R codes?

[h4rvey-g]

I'm running R and jupyter server in a container, and I can successfully connect the VSCode jupyter extension to the container and run codes. But how can I format R code? When I try to do it, it says There is no formatter for 'r' files installed, which suggests me to install a R formatter extension. But it still gives the same warning after I installed R formatter extension (R Tools).