make CTRL-T work with folders outside the current one

[pogopaule]

Let's assume I am in directory /dirA.
There is also a /dirB.

Very often there are case where I want to use CTRL-T to search relative to dirB although I am currently inside dirA.

For example

cd /dirA
...
cat /dirB/<CTRL-T>

So when there is a "path prefix" I'd like CTRL-T to search relative to that prefix.
When there is no prefix I'd like it to work relative to the current directory, like it already does now.

How on earth can I achieve that?

[pogopaule]

The answer can be found here https://github.com/junegunn/fzf/wiki/Configuring-fuzzy-completion#zsh