In version 2.29.0 of SNIP it’s possible to target author pages, too. In this case you may want to include some userdata. Here is how that works.
When editing a Schema Template / Global Snippet, you should set the following rule:
Page Type is equal to Author Page
Then, add some properties to your schema and select “Userdata” for the Field type. In the text box that opens, you can enter one of the following to get the corresponding user data: