You can buy Bluetooth transmitters from Amazon. They are relatively inexpensive. However, using Bluetooth is not likely to give you the same quality of sound as a wired connection.
The signal will be converted to digital by the transmitter and then compressed in one or another Bluetooth codec. That compression is lossy (NOT lossless). The speakers, in turn, will decompress and convert back to analog.
There are many different Bluetooth codecs, some better than others. The last time I read a comparison, Sony’s LDAC codec was the best at preserving fidelity over short distances. At longer distances, as the signal strength decreases, it falls back to lower fidelity.
Not all Bluetooth codecs are supported by all devices. It’s also important to make sure that whatever codec you want to use is supported by BOTH the transmitter and the speakers.
Personally, I think Bluetooth is a mess, suitable for listening on an airplane or connecting a phone to a car, but not so great for high fidelity. However, depending on the circumstances, it might work for your setup.