In India They put there favourite fish at the roots of there plant in soil, so I understand u wanna try.
Butt if u do this u have allready harvest ure plant when the fish is still breaking off in the soil and turns in to nutrients ure plant can use.
So just buy something like fish mix 8€ for 1l.
If u use stuff like that its real food for the grow of ure plant, useless while it Blooms.
I even use it my first 3 weeks as spray for my leafs I do this 2 times a week.
I can assure u the smell is worth it if u see the result ;-)