Default for Multi-Parameter (NOT All) NOT One

Situation - i have a Report - with a Multi-Value Parameter

Value = Label

1

2

3

Now - i know how i select all by default, and i know how check only let`s say 2 as default.

But i need help so check only 1 + 2 not 3 by default.

Tried:

=1,2

="1,2"

="1","2"

...

Thanks for help