googleanalyticsR : How can I get page categories (content group) data?

I am trying to get data on page categories from Analytics, but it seems that this variable does not exist, as looked on https://ga-dev-tools.appspot.com/dimensions-metrics-explorer/.
If you do know how to get this data, the rest of the question does not apply.

If this indeed does not exists, those are the steps that I follow to get "grouped pages" data:

• In order to get page data, I use the dim_filter argument
• I define all the pages I need in all.pages
• The function (x) allows for the iteration over the different page names
• The actual iteration is done with the map function where I pass all.pages through the function (x)
• Then, I create a dataframe
• Because the actual name of the page used in the regex is not in the dataframe, I add them with the mutate function

all.pages <- c("page.name.1","page.name.2","page.name.3")

pages.ga <- function (x) { x.pages <- dim_filter(dimension="pagePath",operator="REGEXP",expressions=x)

x.filter <- filter_clause_ga4(list(x.pages))
x.results <<- google_analytics(ga_id,
                               date_range = c("2019-09-01","2019-11-30"),
                               metrics = c("bounceRate","pageviews","avgTimeOnPage"),
                               dim_filters = x.filter,
                               max = -1)

}

list.pages.results <- map(all.pages,pages.ga)
df.pages <- dplyr::bind_rows(list.pages.results)
df.pages <- df.pages %>% mutate(page.name = all.pages)

This works when there is no dimension but it is rather impossible to do with even a single dimension because the number of rows will not be the same as the length of all.pages.

Would anyone know how to overcome this ?

Thanks in advance to all of you !

Best, D.

It exists under content group

ga:contentGroupXX

Where XX is an integer. To keep things a bit simpler, it would be easier if you go to query explorer and type in content group under dimensions. The integers you have available will populate and you can explore which integer is the one you seek.