iOS/iPadOS devices fundamentally have no provision to accept direct video input from another device.
While Apple's Sidecar feature is designed to use an iPad as an external monitor for a Mac computer, there are prerequisites - such as both devices being signed-in to iCloud with the same AppleID.
A potential alternative, that removes the need for the same AppleID, is to use a third party solution - such as Duet Display:
https://apps.apple.com/app/duet-display/id935754064
However, for a managed Business/Enterprise computer, you will likely require administrative-rights to install the necessary Application on the computer. Your employer may also have a restrictive policy concerning use of privately owned computing devices for business purposes.
Perhaps the easiest solution is to consider purchase of a portable monitor. These are readily available as 15" (and some 17") models, with display resolution up to 4K. When compared with the cost of many iPad models, a portable monitor is a relatively cheap solution for road warriors with need for a second screen.
If you have an appropriate model iPad, the portable monitor can also be used to provide a full extended desktop with iPad's Stage Manager feature:
- iPad Air (5th generation)
- iPad Pro 11-inch (all generations)
- iPad Pro 12.9-inch (3rd generation and later)