Compost with high walnut content

Am wanting to utilize the compost that has been building in this area.

Several years of roughly 2 acres of maples leaves are collected here

Grass is growing. Virginia creeper is present. Small cedar trees.

Old food compost is nearby. Ash from wood stove is nearby as well. Both of these are relatively separate.

High walnut content though, as the last several years of walnut drops are blown into this area. Ive heard that walnuts are a contaminate?

Clearly, I have not been purposeful with this compost area. Is it at all useful?

Thanks