[Answered ]-Unable to install Pillow for Django App using Terminal on Namecheap Shared hosting

pip install pillow==8.0.0 solved my problem. trying to install the latest version will give an error.

I think something like that should help (or whatever is an analog of "sudo apt install build-essential"):

yum install gcc gcc-c++ make 

This may not be the best way to do it, but it has proved time and again to be effective and easy workaround.

This method is for Namecheap shared hosting as the question indicated.
Assuming you already Installed pillow Inside your local environment. Select all pillow file inside the "site-packages" folder and zip compress them as a copy.

Now go back to your namecheap hosting file manager and go to the location (current projects site-packages inside the virtual environment)
/home/abduxdcv/virtualenv/iffi-store-app/3.8/lib/python3.8/site-packages

(/home/shared-hosting-name/virtualenv/name-of-current-app/python-version/lib/python3.version/site-packages)

Upload the zipped PILLOW files and extract them into the site-packages folder you’re already in (Note location above)

Everything should work fine now. Confirm by running python3 manage.py makemigrations and migrate respectively. Since your projects uses models.ImageField() an error should occur if PILLOW isn’t working. If no errors continue with your project.

Unfortunately I can’t include screenshots of the said step because of reputation. I will look for workaround.

Step1: Zip compress installed pillow files locally.

Step 2: Upload the zipped PILLOW files and extract into Namecheap hosted target projects site-packages inside the virtual environment.

PS:
This is a quick answer, apologies for any bad construction.

Update: link to github gist Github Gist