Hi Marco,
I’ve looked up the visual composer source regarding the post grid, but I haven’t found any way of doing it without modifying the composer plugin code. The query arguments are hard-coded, it does not let you add anything to it via query string. I was hoping that there might a filter available for the final grid arguments, but there isn’t. Without custom coding, this does not seem to be possible. Although I recommend asking the VC support as well.
Best,Ernest Marcinko
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