The coco adds no "nutritional value" to the mix, there is coco in the roots organic soil. However coco create k as a by-product of decomposition.
Its mostly an organic filler. Coco also works well as anatural ph buffer, if you water coco at a consistent ph it will hold that ph fairly well, until "re buffered" by consistently watering at another ph.
^ THIS is the only right answer so far.
Coco peat is used as a PH Buffer, Natural filter, and it as Mainly used for Aeration of the soil. Coco peat if very light and fluffy, it allows water to pass through the soil rather than being trapped.
if you can not find Coco peat, look for Vermiculite. If you cant find Ethier one of those just add extra Perlite to the mix.
coco and peat together will provide a better mix. add kelp meal to this. done.
you could grow plants with that, but not great plants.
Peat Moss
Coco peat
Perlite
Bat Guano / Blood Meal
Seabird Buano / bone meal
Kelp Meal
Humic Acids
Green Sand / Azomite
Gypsum / Epsom Salts.
THAT is a "good" soil mix....