My baby was born prematurely at 28 weeks gestation. Is it safe to use a love to dream sleep bag that meets the minimum weight requirement (2.2kgs) with a preemie baby instead of swaddling?

Red Nose recommends using a traditional (light weight cotton/muslin) wrap/swaddle.
https://rednose.org.au/article/is-it-safe-to-wrap-swaddle-my-baby
See also information on the use of swaddle suits/bags or cocoons.
Some of the swaddle suits/bags may risk baby’s head & face being covered, if baby brings hands to the face.
Many babies like to touch their face &/or suck on fingers.
https://rednose.org.au/article/safe-wrapping-or-swaddling-when-to-stop-and-how-to-select-a-safe-sleep-bag

Any form of swaddling/wrapping should be ceased when baby is showing attempts to roll, which may be as early as 3 months.
How old is your baby now?

General information about clothing & bedding for baby.
https://rednose.org.au/article/how-much-bedding-does-baby-need
https://rednose.org.au/article/how-to-dress-baby-for-sleep