For a WordPress website, one of the the easiest yet effective ways to leverage machine learning capabilities of AWS is by leveraging Amazon Polly services bundled for WordPress users as AWS for WordPress plugin.
Activated this plugin for this website that now has a audio version of each post.
From My Security Credentials of your AWS account, copy Access Key details.
Paste the same on fields under AWS, General.
Now go to each published post and enable Text-To-Speech feature.
I have chosen not to activate its translation feature as using GTranslate for the same that helps translate all the web pages content (instead of just posts as in case with AWS for WordPress plugin).