Generating a Renovate Report from someone else's repo

As part of Accessing your Renovate Dependency Dashboard, without GitHub/GitLab Issues enabled, I've been trying to represent a Dependency Dashboard based on Renovate's Report functionality.
As I wanted to explore a few more interesting scenarios, I wanted to see how I could get a Report based on i.e. Renovate's Dependency Dashboard or Backstage's Dependency Dashboard as they have all of the key sections used, and some deprecated dependencies to test with, too.
As I don't have access to the infrastructure for these repos' usage of Renovate (via Mend Renovate Cloud), I needed to find an alternative way of calculating the Report.
Through some trial and error, I found that requesting a report, and then using --dry-run=full
solved it:
# NOTE that the `--dry-run=full` is required to process which branches Renovate will know about
env RENOVATE_REPORT_TYPE=file RENOVATE_REPORT_PATH=renovate.json npx renovate@40 renovatebot/renovate --dry-run=full
This then gives you the full metadata you need to fully render a Dependency Dashboard, or use it for any other purposes, i.e. with Dependency Management Data.