Is it possible to have a shared Ajv schema?

Ask the Experts and Postman Tips
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That did it! I had a brain cramp on needing to parse the string back into an object.

For others that may read this Topic (ajv info in the documentation is lacking!):
This was an invaluable resource for learning JSON Schema https://json-schema.org/understanding-json-schema/
You can run/test ajv and your schema at the command line with ajv-cli https://www.npmjs.com/package/ajv-cli
I saved my schema to a file and a sample data file as well. This let me debug the schema much faster than in Postman
I saved the schema as a collection variable and used this incantation in the Postman test

// Get the JSON schema from the collection variables
var Ajv = require('ajv'),
  ajv = new Ajv({allErrors: true, verbose: true}),
  schema = JSON.parse(pm.variables.get("ttSchema"));

// Test the payload against the JSON Schema
pm.test('Schema is valid', function() {
  let validationResult = ajv.validate(schema, pm.response.json());

  if (!validationResult) {
    console.log('ajv.errors');
    console.log(ajv.errors);
  }

  pm.expect(validationResult).to.be.true;
});

I used console.log() to see the errors. This isn’t an optimal way to get the errors. Better would be to get them to display in the Response/Test Results but I haven’t figured out how to do so.