Is your feature request related to a problem? Please describe.

In RMD files, the yaml metadata header is ignored when evaluating chunks.

Describe the solution you'd like

The above problem can be circumvented by evaluating params <- rmarkdown::yaml_front_matter(\"$$\")$params (e.g., from a custom key mapping) beforehand. This is cumbersome though. It would be better, if the R extension would always do this before evaluating code chunks in an Rmd document.

Describe alternatives you've considered

Users can define a key map but this solution is cumbersome.