Appending variable contents to block

I'm trying to append a variable contents into a block like this - path: "c:\file.txt" f5: [--crf 20 --preset veryfast --tune film --level 4.1] append f5 [ --output path movie.avs] I need to add the "path" variable contents to the f5 block. I can't seem to get the contents, only the variable name when I do this. I tried adding "reduce" like this - append f5 reduce [ --output path movie.avs] but that only works if all the block items are variables. I only have one block item variable (path).

Figured it out -- append f5 rejoin [{ --output "} path {" movie.avs}]

Alternatively, you can also use COMPOSE and parens around values to reduce: `append f5 compose [ --output (path) movie.avs]`