You can group the collection based on "Feature" column using GroupBy function.
For example:
I have this collection:
ClearCollect(
colFeaturesList,
{
Feature: "A",
Name: 1
},
{
Feature: "B",
Name: 1
},
{
Feature: "C",
Name: 2
},
{
Feature: "B",
Name: 3
}
)
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:
ThisItem.Feature
Then I added nested gallery inside above gallery, set "items" property of gallery to ThisItem.Names
and "Text" property of label control to:
ThisItem.Name
Here's the output:

Note: You can use the grouped collection and design UI as per your requirements.