ANSWER:
No, you cannot do ruqya on a person who’s not present.
He should do it himself.
RUQYA FOR CURE:
Do ruqya on water, preferably zamzam and drink lots from it throughout the day and night and also bathe with this water until you’re cured by the will of Allah.
https://www.assimalhakeem.net/what-is-ruqyah-and-how-one-should-do-it/