EDIT on 2020-04-10: as per Eric Hirst’s comment here below (thanks!) apparently now this feature is mapped out of the box to Ctrl + R.
Yes, the Reload from Disk feature is built-in. By default it’s not mapped to any keyboard shortcut, though, so you will have to do it yourself:
Settings -> Shortcut mapper
then choose Modify and map it to your favorite hotkey. Mine is usually mapped to Ctrl + R.
