You can use set_max_delay for that. However, if you use it to constraint logic that has other larger paths going through it, those will be broken. It would be best to do report_check -through a_in -through a_out and see the full path. If that constrant can be adjusted its best. If the path is unconstrainted you should figure out why but can use the set_max_delay without fear of unconstraining constrained paths.

I want to do this report Tom, but I don't know how. Is it an openroad tool? Can you tell me what to type to run the tool? Or a link to docs?

The command is "report_checks -through a_in -through a_out" in openroad. In OpenROAD if you look in the src/sta directory there is a doc directory with a PDF manual for opensta. All of the opensta commands are in openroad.