Placeholder tags for keywords and other metadata field entered through compiler

It would be helpful to have a placeholder tag for project keywords and descriptions (as entered in the Compile pane) so that it would be possible to type those keywords in just one place to both have them included in the document metadata (done now) but also to be able automatically insert them through the compiler in the text of the formatted document. It’s quite common these days to see reports that have a page that includes a document abstract, keywords and copyright information. This would introduce a “write once” capability that would reduce errors and save work over time. If the PDF document information more closely tracked that for ePUB, so the PDF format carried more meta-info, that might help with automated addition of documents to various reference management systems that capture information required for citation.