backstage/docs/conf/defining.md

Defining Configuration for your Plugin

There is currently no tooling support or helpers for defining plugin configuration. But it's on the roadmap.

Meanwhile, document the config values that you are reading in your plugin README.

Format

When defining configuration for your plugin, keep keys camelCased and stick to existing casing conventions such as baseUrl.

It is also usually best to prefer objects over arrays, as it makes it possible to override individual values using separate files or environment variables.