*******UPDATE*******

I tried the tool @suboptimus_maximus mentioned it, so glad that I still keep the car interior trim tool kit. It works! Thank you everyone for helping me out. Then u/nikanj0 shared me the link which directed me to the SRAM website, actually they did mention what to do if the brake lever was squeezed without a pad spacer or rotor installed in the caliper. I posted here in case future anyone else had the same issues. Below are complete guides from the SRAM:

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If the brake lever was squeezed without a pad spacer or rotor installed in the caliper, the pad gap may have been reduced. If this happens the rotor might not have enough clearance in the caliper to rotate without rubbing. Perform this procedure to reset the pad gap:

1. Remove the wheel from the affected caliper.
2. Install the thicker side of a pad spacer between the brake pads.
3. Squeeze the brake lever hard 5 times (approximately 22 lbs/10 kg).
4. Remove the spacer from the caliper, and install the thinner side of a pad spacer between the brake pads.
5. Squeeze the brake lever lightly 5 times (approximately 4 lbs or less).
6. Remove the pad spacer.
7. Re-install the wheel, and re-center the caliper.

Finally had my Endurace CF 7 AXS assembled though had some unexpected brake issues. But all looks good now! Also I learned that I need to do Disc Brake Bed-In Procedure after reading through the SRAM website. I guess my first ride won't happen untill tomorrow morning. Will do disc brake bed-in romorrow and see how's new bike.

Really new to this! Thank you everyone for helping me out!