I know that I cannot use key combinations with chromedriver, but can use JavaScript as an alternative. The example below navigates to google.com and opens a new window tab.
IWebDriver driver = new ChromeDriver();
driver.Navigate().GoToUrl("https://google.com");
IJavaScriptExecutor js = driver as IJavaScriptExecutor;
js.ExecuteScript("window.open()"); // Open new browser tab like CTRL + t do
But can't figure out how to send these keyboard combinations...
CTRL + SHIFT + i
CTRL + SHIFT + m