RSelenium provides a set of R bindings for the 'Selenium 2.0 WebDriver', which in turn provides tool to enable automation of web browsers. Posit Cloud. However, Posit Cloud, as a hosted service, won't be able to open and control a separate web browser (hence the error, "Could not open chrome browser.")
I think the simplest solution now would be to run this on your local machine, where you have control over your OS and can configure Selenium.