There is no direct readout of climb / descent angle in any aircraft.
There is a direct readout of RoC/RoD (although VSIs aren't all that precise and it's better to derive it from altimeter and stopwatch). There is a readout of IAS, which you need to route through intermediate stages of CAS, EAS, to TAS.
The angle (within the local parcel of air that the aircraft's travelling in) is then determined easily enough from RoC and TAS.
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