Text object using ad-hoc tree-sitter queries from nodes under cursor

[bew]

CRAZY IDEA:

A kind of interactive text object maker, usable as a text object.

Problem

With code:

while (line := text_lines[0]):
    # cursor here ~~^

I want to select text_lines[0], the assignment value of the variable.
Possible resolution:

• A dedicated text object for the current expression, but that would probably just select text_lines,
  (edit: or maybe not?)
• A dedicated text object for the value of assignment, but that would eat a key for a very specific use case, hard to find test object keys for all use cases..
  (edit: unless it's moved behind a treesitter-node-specific operator? tv instead of just v 🤔)
• Select the text the-old-way: bvt) (no semantics), BAD because not be reliable in a macro if value is a function call..
  (e.g on while (line := foo(bar)))
• Make a dedicated selection using auto extend/shrink like in vscode/IDEs, but it's not repeatable, and can't be used to extend selection if Add generic visual selection _extension_ using existing text objects #83 is implemented.

Crazy solution

Trigger a custom text object, that checks nodes under cursor and suggest queries to choose from (could be edited on the fly? with preview) to select the wanted text.
The used text-object could then be saved and repeated in some cases (which ones?)