Yeah on a megastructure scale.

A Dyson swarm conducting starlifting, using magnetic pulses to induce coronal mass ejections if hydrogen from a star, collecting the flared material and running it through cascades of fusion reactions to produce heavier elements. The power for energy negative fusion reactions being collected as solar energy from the star the Dyson swarm encircles.

If you've got a star caged enough to capture a significant portion of its energy output, then you have more than enough power to start manipluating the star to lift matter from the star and transmute it into elements to expand your dyson swarm

Very advanced compared to modern humanity, but theoretically possible, such that it's a potential signature of advanced interstellar civilization that SETI surveys have been looking for. A star anomalously dimming in visual spectra while being high on IR spectra, with unusual proportions of heavy elements would be detectable with modern telescopes at intergalactic distances; and would be strong evidence for intelligent technological life.

A long term project of a kardeshev 2 level civilization could be mass scale stellar optimization, shave down short life yelow-blue stars that only last mere few billions of years, and convert them to long life red dwarfs with stable lifespans measured in tens of trillions of years. This sort of mass stellar engineering if being done to thousands or millions of stars, you could spot in the most distant galaxies weve observed