No, it is not.
You could do something like this, but I wouldn’t…
a:
type: string
content: Some regular text.
b:
type: pageReference
content: "/about"
c:
type: pageProperty
content: title
I came up with an eval function a while ago, but I only use for testing and some documentation:
https://discourse.gohugo.io/t/eval-function/32148/5