Merge not contiguous partitions in Ubuntu 18.04

Question

I am using a dual boot system with Ubuntu 18.04 and Windows 8.1. So is it possible and how can I merge unallocated 123GiB which I freed in Windows from my D: Drive (/dev/sda2, ntfs) and move them to /dev/sda6 (84.75GiB, ext4)?

Answer 1

I did what @ubfan1 said in a comment:

You only have three primary partitions, so you could just make the unallocated another partition and mount it somewhere like /home, /usr/local/data,....

So I did this in /home/plus_data. At the end of the day, the aim was to get more space.
Thanks