Frédéric Chopin did not compose a recognized solo piano piece simply titled 'Canon'. This entry is a misattribution or a fragmentary exercise, likely lacking the characteristic stylistic markings of his major works.
As this is not a standard work, check the source manuscript for intended articulation.
Comparable difficulty and character — good candidates for what to learn next.
Canon is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
Canon is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Ballade No.4 by Frédéric Chopin, Ballade No.3 by Frédéric Chopin, Ballade No.1 by Frédéric Chopin — see the full similar-pieces list on this page.