boot - Repair my partitions and reinstall Grub2

I messed up my partitions because I wanted to increase my Ubuntu disk space (I had a boot partition between the two partitions I wanted to merge, so tried to delete merge partitions and re-install grub2) I used gparted.

But I am not able to re-install grub2 facing errors

GRUB failed to install to the following devices: /dev/nvme0n1

I have/had dual-boot configuration with a partition for windows and Ubuntu (I took some space from Windows partition to increase Ubuntu partition)

➜  ~ sudo parted -l
Model: ATA TOSHIBA MQ01ACF0 (scsi)

Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End    Size   File system  Name                  Flags
 1      1049kB  500GB  500GB               Basic data partition  msftdata


Model: PC300 NVMe SK hynix 256GB (nvme)

Disk /dev/nvme0n1: 256GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start  End  Size  File system  Name  Flags

I tried to purge/reinstall grub:

sudo apt-get purge grub grub-pc grub-common
sudo apt-get install grub-common grub-pc

The problem is that GParted don't see any partition anymore :-/ so how can I create my bios-boot partition without damaging the other partitions ?

Disks how a little better view lol but my windows partition is detected as free space...

Thanks