Hello @Nathan Okh ,

You can do this simply by creating a flow designer as follow.

1. Created trigger when user is added group.You can add more conditions using condition builder as per your business requirement.

2. Create a record based group member record. Add more fields, and add the user in any field as per need. I just added in short description field.

And that's it. You are all set. Let me know if anything required.

Kindly mark the answer ✔️Correct or Helpful ✔️If it addresses your concern.

Regards,

Siddhesh