For the job posting, it would be nice to have the "directApply" option.
"Indicates whether an url that is associated with a JobPosting enables direct application for the job, via the posting website. A job posting is considered to have directApply of True if an application process for the specified job can be directly initiated via the url(s) given (noting that e.g. multiple internet domains might nevertheless be involved at an implementation level). A value of False is appropriate if there is no clear path to applying directly online for the specified job, navigating directly from the JobPosting url(s) supplied."
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This functionality comes from the Schema Metatag module suite instead of Metatag itself, so I'm moving the issue over there.
I'm assuming that Marcel isn't working on this anymore.