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yeah, can't find `serverGroupsv2` in even the latest package `@pulumi/azure-native/dbforpostgresql/v20230301preview`

Just read here that the resource is read only: <https://learn.microsoft.com/en-us/azure/templates/microsoft.dbforpostgresql/2022-11-08/servergroupsv2/servers?pivots=deployment-language-arm-template|https://learn.microsoft.com/en-us/azure/templates/microsoft.dbforpostgresql/2022-11-08/servergroupsv2/servers?pivots=deployment-language-arm-template>

Does that mean that the only way to create a Postgres cosmos instance is through the portal?

no, that means the `/servers` resource is a child of the `serverGroupsv2` resource and Azure deploys the `server` resource automatically after you deployed a `serverGroupsv2` resource.
You don't create the server, only the group

I think I figured it out, seems like it is the Cluster that should be used...

It sounds like you solved it. Let me know if you need any help.