Passing escaped string as a request variable throws pre-script error

[g1ashok]

I'm using Bruno client version v2.14.2 and trying to pass escaped string as variable to graphql variables and hitting script error.

Error : Pre-Request Script Error Expected ',' or '}' after property value in JSON at position 17 (line 2 column 16)

My pre-script has this
`let raw = "Joe, Alice";
let names = [];

if (Array.isArray(raw)) {
names = raw;
} else if (typeof raw === 'string') {
try {
const parsed = JSON.parse(raw);
names = Array.isArray(parsed) ? parsed : raw.split(',').map(s => s.trim()).filter(Boolean);
} catch {
names = raw.split(',').map(s => s.trim()).filter(Boolean);
}
}

// Build comparisons: ["==", {"F":"name"}, ""]
const nameComparisons = names.map(n => ["==", { F: "name" }, n]);

// Build the filter AST. Example result:
// ["||", ["==", {"F":"name"}, "Alice"], ["==", {"F":"name"}, "Bob"]]
const filterAst = ["||", ...nameComparisons];

// Stringify
const filterJson = JSON.stringify(filterAst);
const filterEscaped = filterJson.replace(/"/g, '\"').replace(/\n/g, '');

bru.setVar('filter', filterEscaped);
console.log('Filter : ' + filterEscaped);`

Accessing the filter as grapqhl request variable, API expects the filter value to be String
{
"filter": "{{filter}}"
}

I see the correct filter string from the console log

Filter : ["||",["==",{"F":"name"},"Joe"],["==",{"F":"name"},"Alice"]]

I'm not sure how to fix this pre-script error, is this Bruno issue or am I missing something ?