If you want to try it for yourself, you can use a ZWJ sequence of the 🏳️ White Flag emoji and ⚧ Male with Stroke and Male and Female Sign Unicode character. This trick only works on Android devices while using the newest version of WhatsApp. The sequence combines the white flag emoji with the transgender symbol to create the blue, pink and white transgender pride flag.
Android users recently discovered it’s possible to create the Trans Pride flag emoji.