How to convert lumped components to TL segments?
You don't want stubs, they are capacitance to ground. All of your capacitors are shown as floating. For this you'll want interdigitated capacitors, it's going to be hard to get the etching tolerances to control a small gap well enough to get fractions of a pF with any accuracy.

If on the other hand this is a balanced circuit and you can split each capacitor into two series elements, and ground the mid point of each, then you can use stubs, which being capacitance to ground are much easier to implement. Look for radial stub formulae, they will be easy enough to find with your favourite search engine.