Custom alerts for forex and futures?

Excuse me if this post is in the wrong category…

Does anyone know how (or where to go) to set up custom alerts? I’m not referring to price alerts, I’m referring to alerts such as SMA crossovers etc.

For example, “an alert for when a FX pair crosses the 50EMA” etc.

It would save me a lot of time as I follow a lot of different FX pairs, commodities, treasuries, stocks etc.