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Hello
I believe that you cannot travel on public transport to a place as far away as Talca. This rule applied to all of my Chilean clients. The rule is you that you need to reach your place of quarantine within 2 hours and you cannot take public transport.
The good news is that, unless you come from a country like South Africa, if you have your Chilean pasaporte sanitario, your time in quarantine will only be around 12 hours. You will be subject to a PCR test when you arrive at the airport and the results come really fast. Mine was in 8 hours. Once you have the negative result you can go wherever you want.

There are plenty of places on-line to buy a bus ticket Santiago - Talca, the trip taking 3-4 hours.  There is no mention of a time limit, so you may want to try to talk to someone using the contact info found on the web page.

The first link below has as an option, renting a car yourself, or hiring a driver, Santiago - Talca.  You may be able to avoid the quarantine restrictions doing that, versus taking a bus, and it's not that expensive:

get a hotel in vina del mar. the quartine is only for 3 days if yoyr covid test is negative. ir just stay alone for 3 days. im sure 3 days will not kill you.