There are (at least) 2 ways of shooting lightning. 1) with a lightning trigger device/app or 2) by doing long exposures.

1. Lightning triggers are basically light sensors that, once connected to your camera, will detect a sudden change in the ambient light and will instantly command your camera to take a picture. They usually connect to a camera via the remote control port or wirelessly.

I do not know if such devices exist for smartphones. I have seen apps on iOS and Android that claim to achieve the same results but have never tested them (and I doubt they are as good as external devices).

Android

• Lightning Camera - Fast Burst
• Lightning Trigger App

iOS

• iLightningCam 2

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2. You can do long exposures (for example 15 or 30 seconds exposures), in a row, and hope that lightning will strike while your camera is capturing the image. This will work at night or dusk/dawn but it won't work during daytime unless you have access to ND filters. It also requires that you use a tripod and/or leave the camera in a stable position.

Open Camera has ways to control the exposure time but it apparently depends on the device you are using.

For manual shutter speed, first enable Camera2 API under Settings. Then from the popup (three dots) menu you can switch to manual mode by choosing a non-auto ISO. Further control for ISO and shutter speed is then possible from the exposure icon on the main screen.

If any of these options aren't available, it's not supported by the device.

and

This varies by device, but whatever is shown is what the device supports. Only a few devices (like OnePlus) seem to support multi-second long exposures.

Source: Open Camera Discussion.

In conculsion, it might be worth trying one of the exising lightning trigger apps and see if it works for you, or you probably will have to switch to a different device / camera with more controls.