Important
Rome isn't maintained anymore. Biome is picking up where Rome left off, which has work being done on its IntelliJ plugin.
A very basic – and unofficial – https://rome.tools plugin for JetBrains IDEs.
I have no intention of uploading this to the plugin marketplace as this is my first time using Kotlin let alone writing an IDE plugin, so I'd expect things to be very poor.
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Manually:
Download the latest release and install it manually using Settings/Preferences > Plugins > ⚙️ > Install plugin from disk...
Plugin based on the IntelliJ Platform Plugin Template.