This script will calculate when the next candle needs to close for the moving averages to cross.
If you use EMAs that are far away, the convergence point may be ridiculously far away from the chart. I recommend using 'Scale Price Chart Only' with this script.
I think you can use this to organize your watchlists if you trade crossovers. If your cross is completely out of the chart, its symbol can be down below, because the cross is unlikely to happen in the next candle.