We already have docs for connecting to workspaces via the Coder JetBrains Gateway Plugin.

JetBrains is soon releasing remote Development in the EAP version of the JetBrains Toolbox. We need to document the process for connecting to a Coder workspace using the JetBrains Toolbox flow.

An early preview of Coder Plugin in JetBrains Toolbox EAP release.