How to put custom HTML in changeview of django's admin?

When I describe admin options for a model it's possible to put any method in 'list_display' then we can add 'allow_tags=True' and get HTML. Is there any same options but for 'changeview' form? I can change template for the form but there is some calculation which returns HTML, so It's not good idea to put them all to a template.

class OrderAdmin(admin.ModelAdmin):
    list_display = ('__unicode__','render_html')

render_html is a method of model, it works in listview, Putting it to 'fields' doesn't wo开发者_高级运维rk.

This is a hack but it should work.

 class OrderAdmin(admin.ModelAdmin):        
     def render_change_form(self, request, context, *args, **kwargs):
         context['adminform'].form.fields['somefield'].helptext= self.colored_name()
         return super(OrderAdmin, self).render_change_form(request, context, args, kwargs) 
     def colored_name(self):
         return '<span style="color: #%s;">%s %s</span>' % (self.color_code, self.first_name, self.last_name)
     colored_name.allow_tags = True