if= is not required, you can pipe something into dd instead:
something... | dd of=sample.txt bs=1G count=1
It wouldn't be useful here since openssl rand requires specifying the number of bytes anyway. So you don't actually need dd – this would work:
openssl rand -out sample.txt -base64 $(( 2**30 * 3/4 ))
1 gigabyte is usually 230 bytes (though you can use 10**9 for 109 bytes instead). The * 3/4 part accounts for Base64 overhead, making the encoded output 1 GB.
Alternatively, you could use /dev/urandom, but it would be a little slower than OpenSSL:
dd if=/dev/urandom of=sample.txt bs=1G count=1
Personally, I would use bs=64M count=16 or similar:
dd if=/dev/urandom of=sample.txt bs=64M count=16
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