This will be a difficult one, you will most likely have to fork and maintain at least a local copy (in the project, you can use something like the local npm module) as pino is only declared in one part of the entire project: strapi/logger.js at master · strapi/strapi · GitHub
You can create something like a ./packages folder at the root of your project, copy the strapi-utils package there, and modify it. Then you can declare that module using the file:packages/strapi-utils in the package.json. Just note you will have to maintain this fork for every single Strapi update including minor versions and diff your version against ours.