Renovate normally doesn't require to make changes in other files.
It supports many package files, and detects them automatically.
It parses them, and finds the dependencies without needing any change.
But, for package files which is not supported by Renovate, a regular expression
is needed inside the file to let Renovate know where to look while parsing the file.
As far as I know, there is no other way than adding a new line to the file.
We are also using Renovate the same way with bb files as well.
We have got a lot of projects, and potential projects that have several different
dependencies. They are hosted in different repositories, and the idea is to update
their dependencies (or not it depends on the project) regularly, and do it automatically.
Like I said, with the package files that Renovate supports such as npm, Dockerfiles, etc. it is easy to do,
but for our case we need to modify the json file with an added comment. For this reason, Yaml files are
an ideal solution for us.