Adobe After Effects - Remove the padding/composition area around 3 lottie files

I am looking for an expert in Adobe After Effects who can help me remove the padding/composition area around 3 lottie files. Based on what I see on youtube, this can be done in less than 5 minutes by an Adobe After Effects expert.

Desired Outcome:
- The lottie files should fit perfectly within the composition area.

Composition Size:
- I don't have specific dimensions in mind, but I want the final composition size to be proportionate to the lottie files.

Intended Use:
- These adjusted lottie files will be used for a website.

Skills and Experience:
- Proficiency in Adobe After Effects
- Experience with lottie files and composition resizing
- Understanding of website design and optimization