Well yes, but the only parameter being set is $ztr, travel per one revolution.
If the pitch is 10 Threads per Inch, a nut, or the Z axis Lead Screw Nut, will move 1/10″ per revolution, or 2.54mm =$ztr
tinyG does all the distance per step and distance per microstep calcs for you, based on the $_sa = 1.8 degrees ( which is 360 degrees/200 steps) and the $_mi microsteps per step parameter.
If you want tinyG to use smaller steps, eg $_mi=8, you just set that parameter and tinyG computes a new distance per microstep,
$_mi=4 is recommended because 1/314.960mm is already really fine precision for typical milling.
Driving a laser engraver or a 3D printer may introduce additional considerations.