Custom manifest file names with dependabot

Is it possible to configure which manifest files dependabot should monitor?

It seems it works by looking up the standard manifest file names for the configured package-ecosystem.

In my case, using Go, I have two separate manifests: one for my package definition and runtime dependencies (which happens to have none at the moment) with the standard go.mod/go.sum names, and another one for my tools (dev) dependencies, named go.tools.mod/go.tools.sum. How can I tell dependabot to also monitor the latter?

This is the repository, if it helps: https://github.com/gtramontina/go-collections.