How does one declare a macro for the vcpkg project to build?

[dretax]

I've set a vcpkg.json and made a script to install certain dependencies for me, like wolfssl.

for (const [triplet, installRootSubDir] of Object.entries(triplets)) {
    const installRoot = path.join(installManifestRoot, installRootSubDir, triplet);
    const command = `"${vcpkgExePath}" install --x-manifest-root="${installManifestRoot}" --x-wait-for-lock --triplet "${triplet}" --x-install-root "${installRoot}"`;

    exec(command, (error, stdout, stderr) => {
    if (error) {
        console.error(`vcpkg Error for triplet ${triplet}:`, error);
        return;
    }
    console.log(`stdout for vcpkg triplet ${triplet}:`, stdout);
    console.error(`stderr for vcpkg triplet ${triplet}:`, stderr);
  });
}

Where do I declare the macros for wolfssl to be built upon? There are some features unavailable without. Do I set them in the vcpkg.json or pass them as a command line argument?