Iterate mapping over a grid, 3 per row ( or more)

i want to iterate over a grid. filling a list.
I did so successfully on one-item-per-row, its too space-consuming and unattractive

how can i iterate 3 at a time?
instead of this:
iterate{ grid(i) ↓ }

i want this
iterate { grid(i, i+1, i+2)↓ }

this is the mock-up of the ui we want. If it were one entry per row it just iterates downward.we've done that, how can i solve this?
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