Ember,js. Modify app.js and vendor.js before the final integrity seal. One custom step in build pipeline?

I need to change something in my final

app.js and vendor.js

but obvioulsy I need to modify them before the ember-cli-sri integrity https://ember-cli.com/user-guide/#subresource-integrity does its job.

How to do?

There are somewhere the pipeline steps?

Can I insert one step before the final one?