Feasibility, Signatures, and Detectability of Dyson Spheres Around Red and White Dwarfs

To the point

Researchers are examining whether advanced civilizations could build huge energy-harvesting shells around faint stars like red or white dwarfs, what observational signs such megastructures would produce, and whether current telescopes like the James Webb Space Telescope could spot them.

If Alien Dyson Spheres Are Real, These Are the Stars Theyd Pick
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If Alien Dyson Spheres Are Real, These Are the Stars Theyd Pick

Assuming intelligent aliens know how to harvest energy from stars, would humanity be able to spot these high-level structures?