[Feature Request]: Add support for "jp" cross-region inference profile for Bedrock Claude Sonnet 4.5 and Haiku 4.5

[masaha03]

Feature Description

In a recent update, support for the global cross-region inference profile prefix was added to llama-index-llms-bedrock-converse (see PR 20064).
Similarly, AWS now provides a "jp" (Japan) cross-region inference profile for Bedrock Claude Sonnet 4.5 and Bedrock Claude Haiku 4.5 models.
I would like to request that llama-index-llms-bedrock-converse support the "jp" cross-region inference profile for these models, allowing users to select the Japan profile as needed.

Reference:

• AWS official documentation for supported cross-region inference profiles: https://docs.aws.amazon.com/bedrock/latest/userguide/inference-profiles-support.html

Reason

Currently, while the global cross-region inference profile is supported, there is no way to select or utilize the "jp" (Japan) cross-region profile, which can route requests specifically via the Japanese region's optimized resources.
This limitation is problematic for users and workloads that benefit from region-specific inference, such as compliance requirements, latency optimization, or data residency concerns specific to Japan.

Value of Feature

Adding support for the "jp" cross-region inference profile would:

• Enable users to leverage lower latency and regional optimization for workloads specific to Japan.
• Increase compliance with data residency requirements for Japanese customers.