Query

from .models import Borrows, AddressInfo
from django.db.models import Subquery, OuterRef, Value as V
from django.db.models.functions import Concat

Borrows.objects.annotate(
    full_address=Subquery(
        AddressInfo.objects.filter(phone_number=OuterRef("address")).annotate(
            full_address=Concat(V("{\"district\": \""), "district", V("\", \"upazila\": \""), "upazila", V("\"}"))).values("full_address")))