So is there any way to accomplish what I want? I.e. have a file in markdown, convert it to docx, apply reference headers and then finally MODIFY the headers to have custom values as defined in a YAML block? So far it seems like I can do everything up to the last step.I take it I couldn't do say, two passes, where I first apply the reference docx and THEN use a filter to alter the headers? Or am I right in saying the headers will get stripped off even if going from docx to docx...