OK, process started.
Here what I’m facing:
First thing to do is to mount the /boot/efi Linux partition into the EFI System Partition.
Here is the disk and storage process selection screen
As for to try I chose the Personalized process
Next is the partition selection window.
Here I select Standard Partition
Next a window to choose the mounting point is shown.
No capacity was defined.
Finally for this stage is the parameter correction screen.
Here does a problem start.
No hint on how to add the Linux /efi/boot partition to the Windows EFI System Partition.
Capacity box shows the whole capacity.
And formatting cannot be disabled.
So, I aborted.
Now, using the Blivet-GUI.
I select both disks.
No problem creating the BTRFS (partition) volume in disk C: or sda, the data disk.
When selecting the D: or system disk to assign the /boot/efi mounting point…
select the edit tool to establish the mounting point
establish the mounting point
But, the big but…
I opened the editing window to check if formatting can be disabled and
when selecting the Without Format option, the mounting point shows deleted in the screen.