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Current best no neutral smart switches
(startrek.website)
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Yes, try the Sonoff ZBMINIL2 device, which does exactly what you want. Wire it in the box with your existing switch, then you can control the light with either the switch, or via HA. If you have a neutral wire in the electrical box, there's also the ZBMINIR2, which has a relay-disconnect feature. In that mode, it provides continuous power to the the bulb, and sends switch-toggle events to HA to trigger an automation to turn the smart bulb on and off.
No, it's not what I described. That type of relay installed in a switch box, not near lamp bulb. It has some requirements for the bulb, such as "minimum 3W bulb" or bypass. I bet it could cause some blinking effects, I don't what to deal with it.