remove fragment from file path in nginx location block

gistfile1.txt

call:
$domain/sym_assets/**/*.jpg

desired result:
$root_dir/path/on/server/**/*.jpg

$root is different than place on server

location ~ /sym_assets {
  rewrite ^/sym_assets(/.*)$ $1 last;
  root path/on/server/
  try_files $uri $args;
}