Using anchors in mathematical formulas

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I need to set anchors in some letters of a mathematical formula to draw arrows from those anchors. The final plot I am aiming to is attached (the arrow tips are missing). Could you please help me? Thanks!

[johannes-wolf]

This is not possible right now. The problem is, that Typst locate function must return content, but to make this work, cetz has to somehow modify its context object from the locate callback, which is not possible.

You may take a look at the pinit package.

[psads-git]

Thanks, @johannes-wolf, for your answer and for suggesting pinit package!