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It's child's play on the SRAM non-hydro levers. I have not tried on hydro but it looks to be mostly the same process: https://jeffsbike.blogspot.com/2020/05/curing-1x-sram-1x-to-2x-shifting.html?m=1
If the bike you're referring to is this one, then it looks it doesn't have a left shifter paddle so you'd have to source that somewhere
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If the bike you're referring to is this one, then it looks it doesn't have a left shifter paddle so you'd have to source that somewhere
Ah, in this case, you may as well just buy Sram's one.
https://www.bike24.com/p2387444.html
I believe it's an older SRAM Force mechanical/hydro unit - stock on the 1x Slate.