Seems not soBut yes it has checked the focus already on a star and apparently found this inter star system interloper
https://www.space.com/38857-oumuamua-interstellar-asteroid-explained-in-images.html
NASA
The image is a artist impression and discovery of Oumuamua ("Its name, Hawaiian, means "a messenger from afar arriving first") was made by astronomers, Oct. 19, 2017, using the Pan-STARRS1 telescope in Hawaii
The interstellar asteroid 'Oumuamua (circled in blue) is pictured amid faint stars that appeared to smear as the telescopes tracked the moving asteroid.
Looks nothing like the artist impression eh?
If Webb telescope does get a opportunity to look at a inter star system interloper it will be more a spectrographic reading to analysis its composition
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