Are flags from target.json applied by default?

I extracted target.json to go through it and I see different flags there:

  "abi-blacklist": [
  "arch": "aarch64",
  "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
  "disable-redzone": true,
  "env": "",
  "executables": true,
  "features": "+strict-align,+neon,+fp-armv8",
  "is-builtin": true,
  "linker": "rust-lld",
  "linker-flavor": "ld.lld",
  "linker-is-gnu": true,
  "llvm-target": "aarch64-unknown-none",
  "max-atomic-width": 128,
  "os": "none",
  "panic-strategy": "abort",
  "relocation-model": "static",
  "target-c-int-width": "32",
  "target-endian": "little",
  "target-pointer-width": "64",
  "vendor": ""

What interests me is flags like linker, linker-flavor panic-strategy. Are they applied by default so that there's no need to specify them in RUSTFLAGS or in .cargo/config files? Can I set values I want in target.json rather than in other places?

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