You can group the collection based on "Feature" column using GroupBy function.
I have this collection:
Then I can group it by feature name like:
ClearCollect(colGBFeatures, GroupBy(colFeaturesList, "Feature", "Names"))
Then I added one vertical gallery with single label (Title only layout) & set "items" property of gallery to
colGBFeatures and "Text" property of label control to:
Then I added nested gallery inside above gallery, set "items" property of gallery to
ThisItem.Names and "Text" property of label control to:
Here's the output:
Note: You can use the grouped collection and design UI as per your requirements.