ajv-keywords does not work with JTD

**Description**
I want to use the "transform"-keyword to perform a trim on certain string fields. But as soon as I want to add the ajv-keywords library and call addKeyword, I get the following error:

>schema is invalid: data/type must NOT have additional properties, data must have property 'ref', data/type must be equal to one of the allowed values, data must have property 'enum', data must have property 'elements', data must have property 'properties', data must have property 'optionalProperties', data must have property 'discriminator', data must have property 'values', data must match a schema in union

Is there any documentation for this?

**What version of Ajv are you using? Does the issue happen if you use the latest version?**

8.11.2

**Your code**

```ts
import Ajv from 'ajv/dist/jtd';
import ajvKeywords from "ajv-keywords"

const ajv = new Ajv();
ajvKeywords(ajv, ["transform"]). // --> ERROR
```