pinout.vvzero.com/overlay/uart.json

{
	"name": "UART",
	"description": "Raspberry Pi UART pins",
	"pin": {
		"8": {
			"name": "TXD / Transmit",
			"direction": "output",
			"active": "high"
		},
		"10": {
			"name": "RXD / Receive",
			"direction": "input",
			"active": "high"
		}
	}
}