Multi line Parameter Overrides Following Parameter - Bash

Question

I have a bash script that takes input of a multiline string from another bash script. For example it may look something like this

hello
world

if I assign the above string to a variable and pass it as a parameter to my script along with other variables

script.sh $multi_line_string $foo $bar

in my other script, script.sh ill have some like the below snippet to get the parameters and assign them to a variable

multi_line=$1
foo=$2
bar=$3

but the values of each will be

multi_line = hello
foo = world
bar = foo

and what im looking for is in script.sh is to have the full string inside of the multiline variable

multi_line = hello
             world

foo = foo
bar = bar

I understand why this is happening but I want to know how I can prevent the newlines in the variable from being interoperated as another parameter instead of just the one.