Qpdf has tools that go in that direction (but not a flat text format that allows arbitrary edits). https://qpdf.readthedocs.io/en/stable/qdf.html#qdf https://q

Qpdf has tools that go in that direction (but not a flat text format that allows arbitrary edits). https://qpdf.readthedocs.io/en/stable/qdf.html#qdf https://qpdf.readthedocs.io/en/stable/qdf.html#qdf