parameter.sublime-snippet

<snippet>
    <content><![CDATA[
"${1:paramName}": {
    "Description": "${2:-}",
    "Type": "${3:[String|Number|CommaDelimitedList]}",
    "Default": "${4:-}"
}
]]></content>
    <!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
    <tabTrigger>parameter</tabTrigger>
    <!-- Optional: Set a scope to limit where the snippet will trigger -->
    <scope>source.cloudformation</scope>
</snippet>