[Help-bash] Bash syntax for using here-doc's or variables as files in process substitution

[Jesse Hathaway]

I would love to have native bash support for using a variable or a here doc as
file in process substituion, rather than doing something like this:

  cat <(cat <<-'EOF'
    butter
  EOF
  )

  printf -v bubbles 'bubbles'
  cat <(cat <<<"${bubbles}")