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There is RUSTGPU_CARGOFLAGS, which allows to set additional cargo flags, but in contrast to RUSTGPU_CODEGEN_ARGS, which has SpirvBuilder::extra_args counterpart, this one doesn't have any yet.
It'd be helpful to have something like SpirvBuilder::cargo_flags. While at it, I'd also rename extra_args to codegen_args.
BTW RUSTGPU_CARGOFLAGS is inconsistent in naming with RUSTGPU_CODEGEN_ARGS, should have been RUSTGPU_CARGO_FLAGS, though it is then inconsistent with RUSTFLAGS 🤷