Backend code in IDE on wix studio

Hey Im trying to customize my plans and pricing page by following one of Wix Wiz videos on Youtube.

The tutorial was done on Editor X but Im trying to do it on Wix Studio.

Ive made a file inside src > backend called plans.jsw and coded the below

import wixData from 'wix-data';

export const getPlans = async ()=> {
    const results = await wixData.query("PaidPlans/Plans").find()
    return results.items;
}

when I run the code I get the below error,

/usr/local/bin/node ./src/backend/plans.jsw
(node:220) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)
warning:50
Process exited with code 1
Uncaught SyntaxError /user-code/src/backend/plans.jsw:1
import wixData from 'wix-data';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at compileFunction (vm:352:18)
    at wrapSafe (internal/modules/cjs/loader:1032:15)
    at Module._compile (internal/modules/cjs/loader:1067:27)
    at Module._extensions..js (internal/modules/cjs/loader:1157:10)
    at Module.load (internal/modules/cjs/loader:981:32)
    at Module._load (internal/modules/cjs/loader:822:12)
    at executeUserEntryPoint (internal/modules/run_main:77:12)
    at <anonymous> (internal/main/run_main_module:17:47)

Could someone help me what Im doing wrong.

Thank you