There are several ways so I chose the easiest to explain.
2 wire (power in) into the first switch box.
3 wire from 1st switch box to recep box.
3 wire between boxes.
Tie two whites from power in
and 3 wire to recep
Tie all 3 blacks together.
from 3 wire going to recep
goes to common
terminal of 3 way switch. Red and white from 3 wire between switches go to the other 2 terminals. Mark the white wire with black tape.
2nd box: Black to common terminal, red and white to the other two in any order. Mark the white wire with black tape.
Recep: Use needle nose pliers to pry the tab between the brass
screws off. White to silver screw , red and black to the brass screws. The red will be the switched 1/2.
I might be wrong but I believe the op is wanting to get power from a half switched receptacle.
I have to wire it to a receptacle that is half hot half switched