Google Analytics Connector : editing the data in Microsoft M

Hi,

I'm using the Google Analytics connector to pull some data from Google Analytics. In Microsoft M the code looks like this:

let
    Source = GoogleAnalytics.Accounts(),
    #"xxxxxx" = Source{[Id="xxxxxx"]}[Data],
    #"UA-xxxxxxx-5" = #"xxxxxxxx"{[Id="UA-xxxxxxxx-5"]}[Data],
    #"xxxxxxxx" = #"UA-xxxxxxxxx-5"{[Id="xxxxxxxxx"]}[Data],
    #"Added Items" = Cube.Transform(#"xxxxxxxxx",
        {
            {Cube.AddAndExpandDimensionColumn, "ga:date", {"ga:date"}, {"Date"}},            
            {Cube.AddAndExpandDimensionColumn, "ga:hostname", {"ga:hostname"}, {"Culture"}},
            {Cube.AddAndExpandDimensionColumn, "ga:pagePath", {"ga:pagePath"}, {"Page"}},
            {Cube.AddMeasureColumn, "Users", "ga:users"}
        })
in
    #"Added Items"

I can use PowerQuery to continue filtering the data. For instance, if I want to filter the pagePath to only show me pages with /registration/ in their name, then I can adjust the query as follows:

let
    Source = GoogleAnalytics.Accounts(),
    #"xxxxxx" = Source{[Id="xxxxxx"]}[Data],
    #"UA-xxxxxxx-5" = #"xxxxxxxx"{[Id="UA-xxxxxxxx-5"]}[Data],
    #"xxxxxxxx" = #"UA-xxxxxxxxx-5"{[Id="xxxxxxxxx"]}[Data],
    #"Added Items" = Cube.Transform(#"xxxxxxxxx",
        {
            {Cube.AddAndExpandDimensionColumn, "ga:date", {"ga:date"}, {"Date"}},            
            {Cube.AddAndExpandDimensionColumn, "ga:hostname", {"ga:hostname"}, {"Culture"}},
            {Cube.AddAndExpandDimensionColumn, "ga:pagePath", {"ga:pagePath"}, {"Page"}},
            {Cube.AddMeasureColumn, "Users", "ga:users"}
        }),
    #"Filtered Rows" = Table.SelectRows(#"Added Items", each Text.Contains([Page], "/registration/"))
in
    #"Filtered Rows"

This is then showing me the amount of unique users, split by every page that has /registration/  in it.

I however do not want to see this for every page that has /registration/  in it. I want to see it for all pages combined. And as we're talking about unique users, I cannot just pull these numbers like this and sum it up, as there will be loads of duplicates in there.

Is it therefore possible to already filter the Google Analytics pages at the start of the query? As that way it would show me the total amount of unique users for all pages that have /registration/  in it. Something like this (I don't know how to program this so this is really just an example):

let
    Source = GoogleAnalytics.Accounts(),
    #"xxxxxx" = Source{[Id="xxxxxx"]}[Data],
    #"UA-xxxxxxx-5" = #"xxxxxxxx"{[Id="UA-xxxxxxxx-5"]}[Data],
    #"xxxxxxxx" = #"UA-xxxxxxxxx-5"{[Id="xxxxxxxxx"]}[Data],
    #"Added Items" = Cube.Transform(#"xxxxxxxxx",
        {
            {Cube.AddAndExpandDimensionColumn, "ga:date", {"ga:date"}, {"Date"}},            
            {Cube.AddAndExpandDimensionColumn, "ga:hostname", {"ga:hostname"}, {"Culture"}},
            {Cube.AddAndExpandDimensionColumn, "ga:pagePath", {"ga:pagePath"}, where ga:pagePath = /registration/ , {"Page"}}

,
            {Cube.AddMeasureColumn, "Users", "ga:users"}
        })
in
    #"Added Items"

Keen to hear your thoughts!
Best regards

Bas