How to use shortcodes for Meta title


I want to render Meta titles dynamically in markdown files as below. Its giving an error " ```
failed to unmarshal YAML: yaml: line 6: could not find expected ‘:’

title: {{< param appname >}} Dashboard Features
description: Features
weight: 1
layout: subfeature

In the content part am able to render with the following format.

The {{< param appname >}} Dashboard comes with the following features: