Upgrading to higher torque extruder motor creality ender3
So the 'obvious' answer to this problem is to run a slower print speed, so it isn't so much as a case of information being missing, as there being a non-trivial trade off between speed, quality and cost.
Using the E3D products as examples, a double length NEMA17 can indeed deliver twice the kg×cm as a standard one, and a slimline a little less. E3D suggest that 'standard' A4988 drivers are capable of supplying 2A, but this is right at the limit of their performance (and you would certainly want to consider heatskinking/forced cooling).
E3D also list a standard stepper motor with a 5.18:1 reduction gearbox. This should give a good 4x increase in driven torque, and if you can find just the gearbox, that might be the cheapest option. You don't need such a high reduction, but this is limited by the physical size available.
In the absence of any better specs, a physically similar motor might be a good reference. You can check this by comparing various parts from different manufacturers. Regardless of the current capacity, more torque generally means a larger sized part.