Creating a SSM Composite Document that pulls Parameters from Parameter Store - AWS

The task is simple: whenever an EC2 instance is launched with tag key:value I want it to install a specific software. Whenever an EC2 instance is launched with a different tag key:value I want it to install a different software.

I understand that I can create 2 different associations in State Manager that uses runCommand RuneRemoteScript to install software based on the tags, but the goal is to have 1 composite document that can do this.

Any help / guidance would be appreciated!