is there an exec like command? like load(script) or something

[lgfausak]

i've recently discovered yq, i've been using jq for quite some time now, one thing i would like for it to do is be able to exec out...for example:

yaml:
  this: load("cat /etc/motd")

this example would assign this the contents of the /etc/motd file. This is a simple example, my main use case is exec-ing out to get hashicorp vault values for credentials and things. something like:

yaml:
  user: load("vault kv get -field=role kv/value")
  pwd: load("vault kv get -field=password kv/value")

basically return stdout of a system call.