Calculating discount distribution for Reserved Instances across Linked Accounts in AWS Organization

I have an organization with multiple linked accounts. Some of these linked accounts had RIs purchased before the migration to my organization. After the migration, I purchased some RIs through the organization, and this will be a frequent action. The RIs purchased by the linked accounts before the migration and the RIs I bought through the organization have been utilized by various linked accounts and reset monthly.

My question is: How can I extract the amount of discount each linked account is gaining for each RI I own in the organization (including those purchased by the linked accounts)?

In summary, I would like to know the exact discount generation each RI is producing for each account.

Example of what I would like to know:

RI for service XPTW purchased by the organization generated the following discounts: Linked Account A: $100 Linked Account B: $200 Linked Account C: $50

RI for service XPTY purchased by linked account A generated the following discounts: Linked Account A: $100 Linked Account C: $50

RI for service XPTO purchased by linked account A generated the following discounts: Linked Account A: $100