The chant which you're asking about included in, for example, The Complete Book
Dr. Phra Achan Dhammarato, Bhikkhû, PhD. (page 152).
I think that it is traditional (not written recently by or for Imee Ooi).
It starts with "homi", i.e. "May I be".
That's compatible with the commentary in The Path of Purification, which says on page 292,
First of all it should be developed only towards oneself, doing it repeatedly thus: "May I be happy and free from suffering" or "May I keep myself free from enmity, affliction, and anxiety and live happily."
The next paragraphs explain why that "does not conflict with what is said in the texts": maybe that's evidence that this formula, i.e. starting with the first person singular, isn't found in the (earlier) suttas.