Change text in cross reference.

bloemker: I can find any building block or any other method for doing this.

It sounds like what you want is what has been on the FM wishlist for a very long time: "spot cross reference", basically an Xref definition of $MarkerText, which does not today exist.

If so, and you have a very small number of these, you can accomplish this by spinning off a new Xref Marker type:
With the undesired Xref selected, and the Cross-Reference pod handy, click
[Edit]
revise to:
Name: [¢access groups]
Def: [access groups] {the literal text you want}
[Add]
[Done]
[Replace]

The point of the arbitrarily-selected ¢ for custom in the Name is to float all your spot Xrefs down to the bottom of the catalog.

There are other ways of doing this that are a bit more elegant. Reportedly, in Structured mode, you can use Elements to do it.

In Unstructured mode, you can use hidden text frames at the target, that contain the literal text of the needed variations of the source text desired. I'm using these extensively in a current project, in Text Frames, in invisible Anchored Frames, that are outside column (either margin, rotated as needed), and/or or run-into headings. Their small point size text content is hidden by Color Views at publication. It works and covers variations in caps, tense, pluralization, abbreviation, etc.