Luci app to view / control gpio?

Installing and Using OpenWrt
1

Is there a luci app to view and manage gpio?

My router has external antennas, modem power and modem reset gpio it would be nice to be able to toggle and control them much like the led configuration menu.

As i understand it in the past luci had a buttons.lua for doing this but it dissapeared in later versions of luci.

2

In theory they can be controlled like a LED from luci if they actually are GPIO and not directly controlled by the SoC.

But that requires that the gpio pin is to begin with mapped with an alias in the dts file for the device, and that is done in the source code.