How to create fully customisable alerts in pinescript

//@version=5
indicator("Fully Customizable Alerts", overlay=true)
import HeWhoMustNotBeNamed/RecursiveAlerts/2 as ra

//Step 1. What all parameters(keys) need to be sent in alerts.
keys = array.from("{entry}", "{stop}", "{target1}", "{target2}")

//Step 2. Create a default alert template
template = '{\n
         \t"entry" : {entry},\n
         \t"stop" : {stop},\n
         \t"target1" : {target1},\n
         \t"target2" : {target2}\n
     }'

//Step 3. Create a user input where users can alter the default alert template
inputTemplate = input.text_area(template, 'Alert Template')

//Step 4. Define your alert condition.
ma = ta.sma(close, 20)
condition = ta.crossover(close, ma)
atr = ta.atr(14)

if(condition)
//Step 5. Calculate the values for all the keys
    entry = high + atr
    stop = low - atr
    risk = entry - stop
    target1 = entry + risk
    target2 = entry + 2*risk

//Step 6. In the template, replace all keys with values and send alert
    values = array.from(str .tostring(entry), str .tostring(stop), str .tostring(target1), str .tostring(target2))
    alertMessage = ra.updateAlertTemplate(inputTemplate, keys, values)
    alert(alertMessage, alert.freq_once_per_bar)


plot(ma, "Moving Average")