Match your use case: glaze/marinade needs syrupy body; baking needs tang + moisture without making batter runny.
Start with the listed ratio. If your substitute is thinner than molasses, simmer/reduce or use 1 to 2 teaspoon more per tablespoon.
Adjust tang: add a few drops of lemon juice or a tiny splash of vinegar if it tastes flat after mixing.
Adjust sweetness: if the substitute tastes sharper than pomegranate molasses, add a pinch of sugar or honey.
Taste-test: stir into a spoonful of sauce or a small bit of batter before scaling up.