I do not understand your request. When you say "trans" of the transistor, do you mean the collector or the base or the emitter?
The capacitor connected in parallel with the coil is estimated using the equation
Frequency of oscillation (Hz) = 1/(2 x pi x sqrt(L x C))
where L is inductance (H) and C is the parallel capacitor (F). This is only an estimate because it ignores the small contribution from the antenna and from the collector-emitter capacitance and from the collector base capacitance. I think the value of L is about 0.5 uH.
I'm not sure but I think the feedback capacitor from collector to emitter is chosen to provide a reactance of about two to four times the emitter resistor value at the frequency of oscillation. This cap, along with the emitter resistor and the resonant impedance of the tank circuit forms a voltage divider that determines how much feedback is fed from collector to emitter. I think a lot of builders tune this value on the bench to optimize the circuit.
I still don't think either of these circuits is a Colpitts, but whatever.