Before going into details, from an economic stand point it might not make a lot of sense to make your own with aquarium salts. Terrestrial plant fertilizers are rather cheap.
The Rotala calculator can be used for that purpose
https://rotalabutterfly.com/nutrient-calculator.php .
Just put the volume of your fertilizer solution, instead of your aquarium volume; dry dosing and dose to reach a target.
15 on the fertilizer bottles stands for 15% which, for our purposes is the same as 150000 mg/L.
But, 15-15-15 is not N-P-K in most countries. If you look on the back P is actually given as P2O5 and K is actually given as K2O... so in actual NPK it would be 15-6.5-12.5. Thus to recreate a commercially labeled 15-15-15 your targets will be:
NO3: 664000 mg/l
PO4: 20000 mg/l
K: 125000 mg/l
Using KNO3 as your only source of N will push the K way over your target. Most terrestrial plant fertilizers have ammonia or urea as their main source of N. This goes back to the starting point... it may not be worth the bother.
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