improvement ability that makes it only usable once per turn per city

[Bananique-0]

Is your feature request related to a problem? Please describe.
I want to make an improvement that gives stuff but it would be usable so many times per turn so i want it max 1 time per turn

Describe the solution you'd like
make an improvement ability that makes it so a certain improvement can only be used once per turn per city, if possible

Describe alternatives you've considered
ummm maybe if per city is impossible just 1 time per turn throughout empire is fine

Additional context
it would be so cool

[wasdeilonn]

in far future, this will be possible with a mix of different polibScript stuff, which are yet to be added. It may come as a hardcoded improvement ability if fap feels like it but highly unlikely