[Ansible] – How to create and use variable dictionaries in the YAML files?

The key-value pairs can be passed indented in the file like the following example.

  name: valuename
  key: value
  secondkey: 2

Also, it is possible to put all in the same line like the following example.

  {name:valuename,key:value,secondkey:2}

NOTE: Add all values in the same line is not a good practice at all since it makes hard to read. 

For further information, check YAML Syntax in the Ansible documentation.