Webpart migration, Classic to Modern Experience

Hello!

I am working on a Sharepoint Online site in its old default version. I have the specific task of migrating a list that is also in its old version to the modern version.

This list contains a view (the image below) that is used to represent a calendar. The problem with this view is that it is a page made up of two web parts, the filters and the calendar. The problem instead is with the filters that are developed in JavaScript and I can't find a way to migrate them to their new version, since the modern version of sharepoint does not accept JavaScript code or I simply haven't found a way to do it so far.

I've been looking for alternatives like the SharePoint Framework, but I'd like to find a less complex solution. I also thought about making the calendar in PowerApps to easily add the filters, but it has some complexity to replicate the calendar with its events in PowerApps.

Any opinion on this matter would be very useful to me in finding a way to solve this problem.

Best regards.