Package with transform in yaml format does not install

An integration package with transforms defined in YAML format does not install. I see the following error in kibana -

```
[2022-07-18T03:18:43.486+00:00][ERROR][plugins.fleet] Error: Error installing crowdstrike 1.4.0: Unexpected token s in JSON at position 0
at ensureInstalledPackage (/usr/share/kibana/x-pack/plugins/fleet/server/services/epm/packages/install.js:199:11)
at runMicrotasks ()
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async Promise.all (index 0)
at PackagePolicyService.create (/usr/share/kibana/x-pack/plugins/fleet/server/services/package_policy.js:110:33)
at createPackagePolicyHandler (/usr/share/kibana/x-pack/plugins/fleet/server/routes/package_policy/handlers.js:107:27)
at Router.handle (/usr/share/kibana/src/core/server/http/router/router.js:163:30)
at handler (/usr/share/kibana/src/core/server/http/router/router.js:124:50)
at exports.Manager.execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/toolkit.js:60:28)
at Object.internals.handler (/usr/share/kibana/node_modules/@hapi/hapi/lib/handler.js:46:20)
at exports.execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/handler.js:31:20)
at Request._lifecycle (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:371:32)
at Request._execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:281:9)
```

However if I add JSON content to the YAML file the build and installation goes further but breaks with a different error about not being able to create the destination index.