Backstage API Docs Plugin

yarn add @backstage/plugin-api-docs

// packages/app/src/plugins.ts
export { plugin as ApiDocs } from '@backstage/plugin-api-docs';

// packages/app/src/components/catalog/EntityPage.tsx
import { Router as ApiDocsRouter } from '@backstage/plugin-api-docs';

  const ServiceEntityPage = ({ entity }: { entity: Entity }) => (
    <EntityPageLayout>
      ...
      <EntityPageLayout.Content
        path="/docs/*"
        title="Docs"
        element={<DocsRouter entity={entity} />}
      />
      ...
    </EntityPageLayout>
  );