Megacra Soundbar to TCL Remote

Solution
Your question isn't clear.
If you want to use bluetooth to get audio from the TV to the soundbar you can't because the TV doesn't have BT. Use the optical audio output of the TV instead. It should be more reliable, sound better, and cost less than adding a bluetooth transmitter to the TV. Check the TV manual on how to turn on and configure the optical output.
If you want to use the TV remote to operate the soundbar that is not likely.
Since the soundbar doesn't have HDMI you can't use CEC and it's not likely that the codes for an obscure brand would be in the remotes internal IR code list.
Use a Logitech Harmony remote that can be programmed online to operate the TV, soundbar and all your other gear. If they don't have the soundbar IR...
Your question isn't clear.
If you want to use bluetooth to get audio from the TV to the soundbar you can't because the TV doesn't have BT. Use the optical audio output of the TV instead. It should be more reliable, sound better, and cost less than adding a bluetooth transmitter to the TV. Check the TV manual on how to turn on and configure the optical output.
If you want to use the TV remote to operate the soundbar that is not likely.
Since the soundbar doesn't have HDMI you can't use CEC and it's not likely that the codes for an obscure brand would be in the remotes internal IR code list.
Use a Logitech Harmony remote that can be programmed online to operate the TV, soundbar and all your other gear. If they don't have the soundbar IR codes in their huge database you will be able to teach the codes into it so the next person will have those codes available.
 
Solution