Depending on the amount of data, you might be able to shrink the existing NTFS partition, create a partition next to it of the proper filesystem type, move the data between the partitions, delete the NTFS partition, and expand the replacement.
But I wouldn’t attempt that on ant data you care about unless you have backups. I’ve done things like that a lot working in the tech industry, and sometimes things just break.
Depending on the amount of data, you might be able to shrink the existing NTFS partition, create a partition next to it of the proper filesystem type, move the data between the partitions, delete the NTFS partition, and expand the replacement.
But I wouldn’t attempt that on ant data you care about unless you have backups. I’ve done things like that a lot working in the tech industry, and sometimes things just break.