Generally, grape vines are tolerant of the fertility of their soil. However, most require soil that is well-drained.
Grapes tolerate a wide variety of soils but prefer a deep, well drained and only moderately rich soil with a pH around 6.3-6.8. Too rich a soil results in more vine growth and less fruit.
Improve your soil where you intend to plant by mixing an inch or two of plant based organic matter (manures are best for vegetable gardens), peat, or coconut coir into an area 1 1/2 to 2 times the diameter of the needed planting hole and up to a foot deep.
A 2-4” deep layer of mulch (straw, leaves, or wood chips) applied after planting will continue to improve the soil.