sieve: extract first chars of body in sieve script

[Ingo Thierack]

Hello,

is it possible to extract the first x chars of the body of an message to
forward it,
or the complete body inside an sieve script.

I want to forward specific mails via telegram-messenger. No Problem to
extract
the "from" and the "subject".

if header :matches "Subject" "*" {
    set "subject" "${1}";
}
if header :matches "from" "*" {
    set "from" "${1}";
}
       
pipe :copy :try "notify.sh" [ "(${from})# ${subject}" ];

But is it also possible for the body? If I can only pass the complete
body, I
can cut out the first x chars inside the notify-script.

Can't find any hint for that.

Regards
Ingo