Just note that the GET webhook cannot pass #, end of lines and icons like 
in the text.
MQTT would do it, but I do not have the memory to install it 
Solved with a Gemini HomeyScript encodeURL as per below (there is no need to decode on the receiving side).
// EncodeURL
// Script Version: 2.0
// Purpose: URL Encode text and return as a LOCAL tag
// 1. Get the argument (safely handle empty input)
let inputString = args[0];
if (inputString == null) {
inputString = "";
}
// 2. Encode the string (newlines -> %0A, spaces -> %20)
let encodedString = encodeURIComponent(inputString);
// 3. RETURN the string
// This places the value into the local "Result" tag of the flow card.
// We explicitly wrap it in String() to ensure the type is correct.
return String(encodedString);
