Can I get hair transplant on a hypertrophic/keloid scar after direct brow lift?

Hi and welcome to our forum!
Without photos, it is not possible to provide specific suggestions.
We must differentiate the difference between hypertrophic scars and keloids.
A hypertrophic scar represents an abnormal response to tissue injury, resulting in deposition of excess collagen. Its prevalence is increased after infection or in wounds under mechanical stress. The scar doesn't grow beyond the boundaries of the original skin injury. A keloid is a genetic inherited disease in which scars progressively thicken beyond the boundaries of the original skin injury.
The treatment depends upon how long it has been since your surgery, as it may take 12-18 months for hypertrophic scars to regress. The application of pressure and immobilization of a healing scar with silicone gel sheeting may accelerate hypertrophic scar regression but unfortunately the scars are in a very visible location, making camouflage during treatment impossible. The treatment also depends upon the location of the scar. If immediately above the brow, it can be excised (if at least 1 year after previous surgery) and the resulting wound can be closed with tissue advancement (recurrence is uncommon in hypertrophic scars but frequent in keloid formers). Steroid injections may allow for hypertrophic scar regression but may cause local skin discoloration and scar broadening. Its effect upon brow hair regrowth cannot be predicted.
A scar is usually hairless as there are no hair follicles in the dense connective tissue of which the scar is composed. Hair grafting into scar requires inclusion of the follicle with the graft. It is feasible, but if there is a keloid tendency, the procedure may cause further scar development.
Laser treatments are available with varying degrees of success.
Discuss these issues with your plastic surgeon.
Best wishes...