Genetically hack the mRNA and the transcription/translation changes.
No need for a chip. They can change things at will with a mRNA vaccine.
Scan some DNA and run genetic tests almost instantly. The article below describes a 15 min tester. it's from 2014.
New device may put DNA testing in doctors' hands
Published January 17, 2014
https://www.foxnews.com/health/new-device-may-put-dna-testing-in-doctors-hands