Time machine: backup size limit based on client storage

Is it possible to create a Time Machine backup profile that limits the backup size depending on the clients storage. For example, if a Mac has 512gb storage I want to limit their backup size to 1TB but if they have 2TB storage I want to limit them to 4TB. Obviously I could create groups based on device storage size and apply a different config to each group. But I’m wondering if there’s some formula I could enter in the “Backup Size Limit” field or some other method to achieve this nicely. Thanks!