Feature request: Trilateral Cipher

I would like to see a Trilateral cipher added. It is useful for converting between ternary and text, I've been unable to use the built-in base function to achieve the same results.
Perhaps a text to ASCII value function could be useful as well.

Something functionally equivalent to this website ideally: https://www.dcode.fr/triliteral-cipher

Start by comparing the requested behavior with the linked dCode Trilateral Cipher reference and reviewing CyberChef's existing base operation. Clarify whether the scope includes only triliteral text conversion or also a text-to-ASCII function; done means the implemented operation matches the reference behavior and its supported conversions are verified.

Written by the indexing model from the issue text.