Absolutely, it is a good start and perhaps exactly what you are looking for. Have a look at the video here:
Is that Apple/iPad only or can you use Android or MS Surface?
There is an iOS and an Android app. Please have a look at the link I gave to you above:
https://liine.net/en/products/lemur/
The template would be installed on your Lemur app, not on Gig Performer. The template is one I created for myself (I use it with all the bands with which I tour) and while it’s obviously usable as is, my intent was to let others be able to see how it’s done so that users could create their own templates to suit their own needs.