How to upload existing .tgz file into nexus3

Question

I have already created an npm repository in Nexus3. According to my scenario, I have a build command to run then it is created as a dist folder. Under this folder, I have .tgz file. I need to upload this .tgz file to Nexus. I set up my package.json file as follows,

  "publishConfig": {
    "registry": "http://localhost:8081/repository/npm-private/"
  },
  "bin": "./dist/apps/theme-builder-app/my-theme-builder-0.0.3.tgz"

my .npmrc file is also working correctly.

Then I ran the command npm publish. After that whole project was uploaded into the nexus except my files :(

Then I configured the .npmignore as follows,

*
!./dist/apps/theme-builder-app/bst-theme-builder-0.0.3.tgz

!*/bst-theme-builder-0.0.3.tgz

That also not working.

I have attached my folder structure below, and I figured out which file I want to upload to the nexus3.