Query and set ulimit through <demo>.service file in linux (systemd)

See more:

Linux

I am working on a project that needs to manage the ulimit through custom services file (lets say demo.service) on Linux.

I need to add a mechanism where my custom services file should attempt to set the current file descriptor to:

max( current_limit, min(hard_limit, 10240) )

Is this achievable?

LimitNOFILE= in man systemd.exec only allows hardcoded values.

What I have tried:

nothing seems to work, as LIMITNOFILE is the only option that looks to help, but that's a hardcode approach.But i need to perform a comparative analysis and then do the same. Is it possible?