To be direct: it is not recommended, and most introductory courses will not accept you either. A common sign-up requirement is: being able to swim about 200 meters without stopping (or 300 meters with a mask, fins, and snorkel), and being able to float on the surface and tread water for a few minutes—the exact numbers depend on the course standards of the organization you sign up with.
Why is this requirement in place? It is not about swimming fast; it is about “water sense” and self-control in the water. Freediving takes place entirely in the water: falling into the water, cramps, equipment coming off, fatigue after exiting the water—these situations require you to steady yourself using basic water skills. Panic is the most expensive thing underwater, and water skills are the antidote to panic.
If you cannot swim now, the order should be this:
First, learn to swim. The goal is not speed, but being able to swim continuously for a distance, tread water, and relax while floating on your back.
Then practice breath-holds in a supervised pool. Breath-holding in water must be done with someone who has rescue capabilities present, including in shallow water.
Do not use “I can hold my breath really well” as a substitute. Breath-hold ability and water skills are two separate skill sets; the former cannot replace the latter.
In one sentence: Water skills are the entry ticket, not an elective. Build them first, and you will find every later class much easier—and safer.