It turns out it's really hard to find a hijab-friendly hair color salon. After browsing, finally decided to contact Aurel Menteng, and it turned out they could accommodate hijab clients. The place is cozy, the staff are friendly, Ms. Lya is also very communicative about the coloring process. Thank you Aurel Salon Menteng!
I suggest contacting the salon first if you use a voucher, because after the consultation, additional costs may be required. They are transparent about their fees during consultations, so clients are not surprised when suddenly there is an addition. Recommended!