reuse annotate makes it simple to add the appropriate headers to files.
It also offers an option to not use a header, but instead a .license file for files that cannot or shouldn't be annotated with a header.
However it does not offer an option to add entries to the REUSE.toml file, i.e. entries to this file always need to be created manually.

Similar to the --force-dot-license and --fallback-dot-license options for reuse annotate, I would like to see the options

reuse annotate --fallback-reuse-toml
reuse annotate --force-reuse-toml

to add entries to the REUSE.toml file for specified target files.