Increasing Microsoft Graph Per-Mailbox Throttling Limits (PUT/POST/PATCH & Concurrency)

I am referring to the per-mailbox throttling limits documented here: https://learn.microsoft.com/en-us/graph/throttling-limits#limits-per-mailbox

Specifically:

1. 150 MB limit for PUT/POST/PATCH requests within a 5-minute window
2. 4 concurrent requests per mailbox

In a multi-tenant SaaS application scenario, these limits can become restrictive when processing large volumes of mailbox data.

I would like clarification on the following:

1. Is it possible to request an increase in these per-mailbox limits through Microsoft (e.g., via support or a formal quota increase request)?
2. Are there recommended architectural patterns or best practices to efficiently handle high-throughput scenarios while staying within these limits?
3. Can tenant administrators (our customers) configure or influence these limits through Microsoft 365 admin settings?

Any official guidance or recommendations would be highly appreciated