[Feature request] Providing a YAML header parameter for md files to include external scripts at different locations

[kulbhushanchand]

Presently theme offers a method to add scripts via modifying _config.yml as mentioned here.
However this makes scripts to include in each of the blog page.
Can we have the similar YAML parameters for the header in md post/page to include external scripts in that very page only at selected locations (i.e. head_scripts:, footer_scripts:, and after_footer_scripts:)?