Extract all hydropower stations or dams along one river

I am looking for a way to get all hydropower stations or dams that are along a given river via Overpass turbo. Something like the following but for a given river instead of a given country:

[out:json][timeout:25];
{{geocodeArea:Sweden}}->.searchArea;
(
node["power"="plant"]["plant:source"=hydro](area.searchArea);
way["power"="plant"]["plant:source"=hydro](area.searchArea);
relation["power"="plant"]["plant:source"=hydro](area.searchArea);
);
out center;

For example, for all hydropower stations or dams along Luleälven (https://www.openstreetmap.org/relation/6974663). Perhaps it is possible to generate a search area that covers the river, e.g. extending the center of the river bed by 200 m on each side of the river. Or by using a search area that is defined to be "near" the river (most hydropower stations are on the river, but sometimes, they can be besides it, e.g. when the original river bed is bypassing the power station). Perhaps one could even use a search line instead of a search area.

Thanks for all hints!