Can I steal neutral from fixture for 3-way switch device with no neutral?

my 3-way switch is wired this way, because i am unlucky:

so i have neutral in the line box, no neutral in the load box. i want to use a leviton smart switch that requires neutral in both boxes. if i were crafty enough, could i pigtail a new line off the neutral line in the fixture to run down to the load box? i am super green at this, so forgive me for asking a stupid question. there's also some information out there saying i can use one of the travelers as neutral, which i'll try first… i'm just playing 'worst case scenario'.