Mounting dir that is outside docker context

Question

I'm trying to use BuildKit RUN --mount=type=bind to mount a directory that is two levels up from the docker context dir. Here is a simplified dir structure.

project   (dir)
   app    (dir)
   docker (dir)
      docker-compose.yaml (file)
      some-dir1 (dir)
      app (dir)
         Dockerfile (file)
         some-file  (file)

project/app is the dir containing the java project build with gradle. project/docker/app is a docker context of the image that will contain the app.

Here is the Dockerfile:

# syntax=docker/dockerfile:1.2
FROM gradle:8.3.0-jdk17-alpine as builder
RUN --mount=type=bind,target=/home/gradle/app/,source="../../app/",rw \
    cd /home/gradle/app/ && \
    gradle clean && \
    gradle bootJar

When I'm trying to build docker image I get the error that docker doesn't see ../../app dir.

ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref 2f6eb37e-c9dd-424b-bc15-b41d19994e1c::eg16xi09kr6tsssono9tcri5e: "/app": not found

Is it possible to mount dir from outside of the docker context?