As snowhead says, yes, you can get specific conversion kits, but personally I wouldn't recommend it as when flush valves fail they usually leak continuously into the toilet pan, giving little indication to anyone who isn't looking for it that they're wasting gallons of water a day.
Perhaps it's worth doing if it is for your own use, but I have had to deal with three of these in holiday lets that had probably wasted thousands of litres before I spotted them: two of which while on other jobs and the third when looking for unidentified water losses while the property was vacant during lockdown.
Lever opreated siphons fail obviously and without any water loss.
It can be done as above, however, the button will likely protrude, it won’t look like a modern push button as they have larger holes, designed to take a button.
Thanks for all the replies guys. Only reason for doing it in the first place was to change the seat for a soft close one. When i fitted the new seat it would not stay upright as the lever stopped it going back far enough. I might just do a revamp and change the cistern as well as it has probably been there since time began.