How do I save custom info. in a PNG file like attached pics?

Hi,
You probably have heard about the new whatsapp stickers. I have managed to make my own but I can’t include my name with any file like others. I asked someone who did this and he says he uses Xcode to make his pic ( only runs on MAC) but I can’t believe I need a 5GB program to do this little thing. Is there anyway to manage embedding my info. in a PNG without too much frustration?

45304340_10217018689236960_1623547738681507840_o

now my own pic just says “you”
45189642_10217018689036955_383174562419834880_n

Hope someone can help.

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