What if software engineers started asking companies during the hiring phase, "Do you offer an open source purse as a benefit, so I can contribute to projects I

What if software engineers started asking companies during the hiring phase, "Do you offer an open source purse as a benefit, so I can contribute to projects I believe in or that may be benefiting the company?" I think software engineers have some leverage here, because what company doesn't want to prove they are values-aligned with their engineers?