Hello Yaniv Beniluz,
There are some packaging options missing for the i.MX6ULL on the latest version of the Pins Tool. Thanks for pointing this omission out, we have escalated this so the missing package configuration gets added.
The only available alternative in the LFBGA272 package is MCIMX6Y7xxx05 which you should be able to use as reference for your design in the meantime. Are you being able to see this alternative on the Pins Tool? If no more alternatives are showing it could be that the NXP repository cannot be reached, as the Pins Tool fetches the available configurations from the web.
I hope this helps!
Regards,