Typo3 V10 tx_gridelements_view_column_0 not shown

Hi, I'm working on a new Typo3 V10.4.4 My gridelements-template content is not shown, but the Fluid-html-container is shown.

My templates are done using Fluid and are configured like the follow:

tt_content.gridelements_pi1.20.10.setup {
    2 < lib.gridelements.defaultGridSetup
       2 {
           cObject = FLUIDTEMPLATE
           cObject {
               file = EXT:aaa_intranet/Resources/Private/Gridelements/Halfhalf.html
           }
       }
    }
}

My Fluid-Template:

<section class="grid half-half">
    <div class="frame">
        <f:format.raw>{data.tx_gridelements_view_column_0}</f:format.raw>
    </div>
    <div class="frame">
        <f:format.raw>{data.tx_gridelements_view_column_1}</f:format.raw>
    </div>
</section>

I can see the section.grid and .frame in the inspector, but there is no content rendered.

Has anyone an idea how to fix this? Thanks in advance.