Set header depending on value of upstream header

How can I set a different header depending on the value of a header returned by the backend?

Specifically I’d want to set a different Content-Security-Policy based on what X-Frame-Options the backend sends

In nginx I’d use

map $http_x_frame_options $frame_ancestors {
  default "https:";
  "DENY" "'none'";
  "SAMEORIGIN" "'self'";
  "~ALLOWFROM (.*)" "'self' \1";

server {
  add_header "Content-Security-Policy" "... frame-ancestors $frame_ancestors";

Is there a way to achieve the same thing (or at least just DENY, SAMEORIGIN and the default) with Caddy?

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