Assign a stack into a specific terraspace environment

Hello,
Is it possible pin a specific stack into a terraspace environment through a file ? The idea would be to not have to pass TS_ENV at each run time but have terraspace read the information from a file in the stack.
Thanks.

Thinking this may be better done with a wrapper script. Though, wondering what you were thinking it would work like if it did support a file. Some examples would help.