I think the best way would be to follow context clues from professional fertilizer companies.
Let’s look at Organics Alive for example.
Veg Week 1 10-2-2
Veg Week 2 10-2-2
Veg Week 3 10-2-2
Veg Week 4 10-2-2
Flower Week 1 14-7-7
Flower Week 2 14-7-7
Flower Week 3 14-17-15
Flower Week 4 8-20-18
Flower Week 5 4-25-21
Flower Week 6 0-22-26
Flower Week 7 0-4-20
Flower Week 8 0-0-0