Seeking next.js advise

I have an older site running Laravel 7 and bootstrap / jQuery. I've been asked if it's possible / doable to integrate next.js and render particular parts of the site using the existing front-end and other part using next.js. I have no experience using next.js but I understand from the Breeze documentation https://laravel.com/docs/10.x/starter-kits#breeze-and-next that I need to use different ports for front-end and back-end.

That would be fine for a new application, but how would I achieve the same without breaking the current site? A possible solution I can think of is running the next.js front-end on a different subdomain, but that's far from ideal. Any better solutions? Or tips on how to approach?