Display RSS Feed Description of selected Title

Hei There,
Since i'm no programmer, i should be able to make this happen in siena, so thanks for clear explanations in advance. I would like to display the RSS-Feed Titles in one Listbox, and then show the Content (Description) of the selected RSS-Title in the second
Listbox. How would i do this? My best attempt ist the following sting which doesnt work:
rss_1(Filter(Listbox1,SelectedItems!Description))
rss_1 is my RSS Data Source
Thank you so much for your Help

I found a solution to this Problem (Thanks to @Marcel Spring)
1. Create a gallery (i used a custom gallery)
2. Use a Text Label as Visual
3. Only Show RSS-Title
4. Add Visual HTML Text
5. Use the function <<Gallery3!Selected!description>> In my example, the Gallery3 was the above mentionend custom gallery.
Done :-)

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