Mk_oracle: trend on tablespace growth to estimate when it will become full

Hello,
I’m interested in having an estimation of when the tablespace will become full and generate alarms based on that. Let’s say, when the tablespace will become full in less than one month, I want a warning, but a critical in case it is supposed to become full in less than one week.
This is something that I can see already on the ASM diskgroups and I think that, having the code for the diskgroups, it shouldn’t be difficult to implement the same for tablespaces.
Did anybody already try something like this?
Thanks and best regards,
Rafael