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Embed a Wave dashboard with a simple filter

I feel like this should be easier and I am missing something.
My data set is based on a custom object, links to Opportunity, links to Account.
I have a dashboard I want to embed in Account. Only 1 dataset on this dashboard.
Example from help:

        "service": {
            "AccountId": ["$Id"],
            "Industry”: ["$Industry"]

My attempt:

        "Acct_Opp_RSS_RSSA": {
            "CustomObject__c.Opportunity__c.AccountId": ["$Id"]

Do I need to address other dimensions if I have no interest in filtering by them?