Hi,
You can edit the prefix-list and do a load merge.
Before that you may need to use some scripting or editors to append the ';' to the prefix list.
I normally use sed on *NIX to append the ';'
Example:
> sed -e 's/$/;/' prefix.txt
Then, edit policy prefix-list xxx, load merge relative terminal. Example below:
[edit policy-options prefix-list TEST]
root@PE2# load merge relative terminal
[Type ^D at a new line to end input]
94.38.108.24;
94.54.42.82;
94.61.171.253;
94.62.98.162;
95.128.34.171;
95.139.161.113;
95.141.27.91;
95.141.31.16;
95.141.31.19;
load complete
[edit policy-options prefix-list TEST]
root@PE2# show
94.38.108.24/32;
94.54.42.82/32;
94.61.171.253/32;
94.62.98.162/32;
95.128.34.171/32;
95.139.161.113/32;
95.141.27.91/32;
95.141.31.16/32;
95.141.31.19/32;
There might be other ways of doing this, network automation using Ansible or Junos space for instance, but those do not involve the JUNOS CLI.