How do i create a custom create bulk?

I have "license" resource, and the crud is already done, but now i want to add a custom page in the panel to create bulk licenses, for example 100 keys for the same product without having to make them one by one. I want to add a TextInput (number) with default of 1 to create N licenses, and the most important part to SHOW or print all the just created licenses in a modal or a new page?