The XLIFF standard supports the notes tag, in which notes can be passed along to the translator and is supported by translation systems our there, like OneSky.

Adding notes to existing files does not break symfony in any way, however running the automated translation update command does. It basically ignores the field so the new files do not have notes anymore.

I'm imagining that doing this may imply in changing the message catalogue to support extra information, but there may be other ways to achieve the result.

I would like to know how feasible it is, what solutions people can see, before attempting to do it. Or if anyone has found a separate solution they can share.