Bitcoin Core currently only support to using RDRAND / RDSEED instruction on x86 architecture when requiring to generate a ultra high quality random numbers. For example, a private key.
https://github.com/bitcoin/bitcoin/blob/master/src/random.h
https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp

ARM later added two new similar instructions as well, RNDR (similar to RDRAND) / RNDRRS (similar to RDSEED).
https://developer.arm.com/documentation/ddi0601/2022-12/AArch64-Registers/RNDR--Random-Number
https://developer.arm.com/documentation/ddi0601/2022-12/AArch64-Registers/RNDRRS--Reseeded-Random-Number

OpenSSL also had a similar feature request on last year. (Implemented)
https://github.com/openssl/openssl/issues/15627
https://github.com/openssl/openssl/pull/15361
https://github.com/openssl/openssl/blob/master/providers/implementations/rands/seeding/rand_cpu_arm64.c

I hope this feature is also available on Bitcoin Core as Bitcoin Core also can using on ARM machine (E.g. A Mac computer using Apple silicon, Raspberry Pi...).
FAST, 
    SLOW, 
    PERIODIC, 
};
static void ProcRand(unsigned char* out, int num, RNGLevel level) noexcept
{
    
    RNGState& rng = GetRNGState();
    assert(num <= 32);
    CSHA512 hasher;
    switch (level) {
    case RNGLevel::FAST:
        SeedFast(hasher);
        break;
    case RNGLevel::SLOW:
        SeedSlow(hasher, rng);
        break;
    case RNGLevel::PERIODIC:
        SeedPeriodic(hasher, rng);
        break;
    }
    
    if (!rng.MixExtract(out, num, std::move(hasher), false)) {
        
        CSHA512 startup_hasher;
        SeedStartup(startup_hasher, rng);
        rng.MixExtract(out, num, std::move(startup_hasher), true);
    }
}
void GetRandBytes(Span<unsigned char> bytes) noexcept { ProcRand(bytes.data(), bytes.size(), RNGLevel::FAST); }