Hello!
You can import them along with selection names via Import Selections for Auto-Trading. See the video tutorial:
https://youtu.be/-zNhSl5ypn0So you'll need to write to your own import file:
["selection_name"]\t[var1]\t[var2]\t[var3]...
Then press Import Selections for Auto-Trading and import the previously written values. Make sure you press "Reimport every ... sec" (choose the frequency of reimport). After this, the program will automatically check on new values in the file you're writing to and reimport new selections.
Make sure that the syntax is as I suggested above. All values in the import file must be separated with a Tab character (\t). In the triggers, you can access var1, var2, var3, etc. with imported_1, imported_2, imported_3, etc... variables.