No, Gregorian chant is characterized by a specific rhythm known as a non-metric or free rhythm, where the timing of the notes is based more on speech patterns than on a regular beat.
There isn't a requirement of rhythm for a free verse poem.
Free verse has variable rhythm.
Donald Davie's Some Notes on Rhythm in Verse was created in 1972.
a verse
verse is a verse or poem that doesn't rhyme but has a strict rhythm, usually iambic pentameter.
Blank verse is characterized by its regular meter (iambic pentameter) and unrhymed lines. You can tell a poem is written in blank verse by counting the syllables in each line and noticing the natural flow and rhythm without any rhyme scheme present.
A Verse
a verse
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a verse