These alerts have an alert_message placeholder which allows you to compose in PineScript very complex alerts and insert quite a lot of information in them.
This is just very simple example of how they can look like.
Pine Programming v5: https://qntly.com/pineprog
Adv.Pine Use-Cases: https://qntly.com/advpine
Access to Pro Indic.: https://qntly.com/proind
Hire Me: https://qntly.com/hirepine
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.