@divyendu sorry for the late reply - new years, and whatnot 😉 in the meantime, I also managed to find a solution to my issue:

findBlasWithFooTextContaining: (_, { search }, ctx) => {
    return ctx.prisma
        .foos({
            where: {
                text_contains: search
            }
        })
        .bla()
        .then((foos) => {
            return R.map(R.prop('bla'), foos);
        });
}

so the trick basically was to just shave off the unneeded

Foo

😉