When you're using old style steam switches, 3-way circuits look like this.
Yellow=travelers, red=switched-hot. Note in this switch position the light will be off.
Notice that there are 2 travelers, and the remote 3-way is lucky if the third wire is neutral. There's no question of bringing always-hot along with the travelers; there simply isn't a 4th conductor in the cable. (And you can't use ground).
Smart switches instead
In this setup, wires 9 and 7/2 are always-hot. Wires 10, 8/1, 6 and 5 are neutral. OK, we got hot and neutral to the far box.
To switch the outside light, you put a plain switch between always-hot 2 and switched-hot 4.
To switch the inside light, we get a 3-way "smart switch". It hooks up as follows:
- Neutral to 1/5/6.
- Always-hot (LINE) to 2.
- Switched-hot (LOAD) to 3.
- Traveler (if needed) to 11.
Oh wait, you wanted 3-way control. OK, we also put a smart switch "remote" in the other box. It gets:
- Neutral to 10/8
- always-hot to 9/7
- If needed, traveler to 12.
All grounds get spiderwebbed to each other.