I thought the part INSIDE your meter is a (Transient Voltage Suppressor), not a cap. The TVS basically ACTS like back to back Zenier diodes. It's physical size determines how much energy it can absorb.
It is usually placed in Parallel with what's being measured to act as a clamp.
Removing it, should allow the meter to work without any protection. So, your first step is to remove it, repair the tracks and see if the meter works.
As for the cap in the microwave, here is a pic of one.
https://www.appliance-parts-experts.com/13QBP21090-capacitor.html Note the 2,100 Volts AC rating. That should be enough to SCARE you and easy enough voltage and current to kill you.
I worked on stuff a but more scary. An X-ray diffraction set with a 100 KV, 0.1 A power supply and an electron beam evaporator that had a 15 KV, 1 Amp supply with a Shunt Tube/Valve regulator and a 1000 W rube RF transmitter. If you don't know what your doing, you don't mess with it.