Supplementing formula

My baby is 3 months old and shes been exclusively breastfed till this point. I had to go back to work at 8 weeks and since then my supply has dropped alot and I know shes not eating enough so weve decided to supplement with formula. Theres no confusion for her and shes gone back and forth easily between the two the last couple days. Any recommendations for formula for breastfed babies? Also anyone have any type of schedule and amounts for each feed they wanna share with me? Were gonna give her formula first thing in the morning and I usually have about 10 ounce of breastmilk to give her while Im at work. Just wanna get an idea about the amounts and frequency of the feedings when going between the two. Thank you 💖