Torque-arms are a requirement for a hubmotor. The more powerful the motor, the stronger the torque-arm needs to be. The problem with torque-arms is that they have to fit the bike frame, and there are dozens of variations that prevent one design from fitting them all.
There are several "universal" designs that are adequate for "most" frames and "average" power levels. But...once you spec an odd frame and throw in a powerful hubmotor. You have to draw and order it for yourself.
Here's my take on a pinching TA (https://endless-sphere.com/forums/viewtopic.php?t=74899
The axle slot is lower than the stock 26-inch wheeled-frame, but...I also moved the new axle location a hair back to reduce wheelies (longer wheelbase) and as a result, the stock chain could go from a 7-speed plus derailleur to a single-speed freewheel with no chain tensioner, just move the axle back in the slot to tension the chain.
Anyone who wants, please copy this, and use or sell as much as you like.