@Cyril06
Please consider the following formula on a Gallery Items property:
DropColumns(
AddColumns(
AddColumns(
GroupBy(
Table(
{Title:"PC01", Color:"Red", Modified:DateValue("1/20/20")},
{Title:"PC01", Color:"Blue", Modified:DateValue("1/22/20")},
{Title:"PC02", Color:"Green", Modified:DateValue("1/26/20")},
{Title:"PC03", Color:"Yellow", Modified:DateValue("1/25/20")},
{Title:"PC03", Color:"Red", Modified:DateValue("1/28/20")},
{Title:"PC04", Color:"Green", Modified:DateValue("1/12/20")},
{Title:"PC04", Color:"Blue", Modified:DateValue("1/24/20")},
{Title:"PC04", Color:"Red", Modified:DateValue("1/28/20")}
),
"Title", "records"
),
"recent", First(SortByColumns(records, "Modified", Descending))
),
"Color", recent.Color,
"Modified", recent.Modified
),
"records"
)
Three labels in the Gallery - ThisItem.Title another with ThisItem.Color and another with ThisItem.Modified
Will give you the following:

I hope this is helpful for you.