Hell I think i found a solution
i try and seems work so please can confirm me ? someone more experted than me!!!
I created a rule for cdn ip list with 2 enters on firewall... then exported via json the firewall rules and named file (original to have as backup)...then using a text editor like Notepad++ founded where the addresses are and simply put one by one comma separated... then imported again the modified file (json) and seems all rules are a their position loaded correctly
Possible so simple????