There isn’t a specific writeup for hot tubs as it can be quite variable depending on how people run them.
For a chlorine hot tub, you would use the same FC/CYA ratio as in pool, 7.5%. For a tub with 30ppm CYA, that would yield a minimum FC of 2.5ppm. So you would want to keep your daily FC between 2.5 to 3.5ppm when not in use. How you chlorinate the tub prior to using it if after use is up to you. Some people like to soak in lower FC levels and then bump it up to a high FC level after getting out while others add chlorine prior to getting in. Either way, the FC needs to be maintained at or above the 7.5% ratio and you can only know how often to dose based on your testing and usage.
As for TA, that’s kept lower because hot tubs have A LOT of aeration and so low TA is necessary to keep the pH from rising too high. pH can vary from as low as 7.0 to as high as 8.2 and few people will notice it. So it’s not that critical to aim for a specific pH as long as you keep the TA in check.
CH is generally not an issue as most people will dump their tub water long before calcium hardness is ever an issue.