OrgId cannot be set in provider config secret

[patst]

Hey there,

thanks for providing this crossplane provider!

We are having a shared Grafana instance with different organisations for teams. I want to create resources (Folders, API Keys, ...) for the different teams in their organisations.

Since most of the resources do not support setting a OrgId on resource level for the currently published version (grafana/provider-grafana:v0.3.0) I am trying to set the org_id at the ProviderConfig level.

If I set it as number (as it is typed here: https://registry.terraform.io/providers/grafana/grafana/latest/docs#org_id ), I get the following error while trying to create a Folder resource:

status:
  atProvider: {}
  conditions:
    - lastTransitionTime: '2023-03-31T10:31:46Z'
      message: >-
        connect failed: cannot get terraform setup: cannot unmarshal grafana
        credentials as JSON: json: cannot unmarshal number into Go value of type
        string
      reason: ReconcileError
      status: 'False'
      type: Synced

When I change the org_id type to a string a Folder resource is successfully created, but always in the main org with id 1 and not in the org specified in the ProviderConfig.
The same seems to be true for boolean flags like insecure_skip_verify. Which cannot be set as boolean in the JSON config but won't work when set as string value.

My secret for the provider config + config itself:

apiVersion: v1
stringData:
  instanceCredentials:  |
    {
      "auth": "admin:<mypassword>",
      "url": "http://grafana.grafana.svc.cluster.local/",
      "org_id": "6"  # or 6 
    }
kind: Secret
metadata:
  name: grafana-admin-creds
  namespace: crossplane
type: Opaque
---
apiVersion: grafana.crossplane.io/v1beta1
kind: ProviderConfig
metadata:
  name: grafana-provider-admin
spec:
  credentials:
    source: Secret
    secretRef:
      name: grafana-admin-creds
      namespace: crossplane
      key: instanceCredentials
---
apiVersion: oss.grafana.crossplane.io/v1alpha1
kind: Folder
metadata:
  name: testfolder
spec:
  forProvider:
    title: 'Crossplane Folder Test!'
  providerConfigRef:
    name: grafana-provider-admin

Are my assumptions wrong or do you see a error in the configuration?

Thanks for the help and providing this!