Is it possible to call functions as a parameter in styled-components?

I use styled components and I want to set the transform to:

value x if condition is true, value y if condition 2 is true, null if none are true.

I didn't find much information online so I tried something like:

const altDirectionFunc = (props) => {
    if (props.altDirection === 'row') {
        return 'translate(30%, -50%)'
    } else if (props.altDirection === 'column') {
        return 'translate(-50%, 30%)'
    } else {
        return null
    }
}

const StyledCheckbox = styled.div`
    position: relative; 
    height: 2.5em;
    width: 2.5em;
    background: ${props => props.isChecked ? props.theme : 'transparent'};
    border-radius: 10px;
    border: 2px solid ${props => props.isChecked ? props.theme : vars.black};
    cursor: pointer;
    transition: all 400ms ease;
    border-radius: ${props => props.circular ? '50%' : null};
    &::before {
        font-family: "Font Awesome 5 Free";
        font-weight: 900;
        content: '${props => props.isChecked ? '\f00c' : null}';
        color: white;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -45%);
        font-weight: 900;
        font-size: 1.2em;
        transition: all 400ms ease;
        line-height: 16px;
    }
    &::after {
        content: '${props => props.altText}';
        opacity: ${props => props.isChecked ? '1' : '0'};
        transition: all 400ms ease;
        color: ${vars.black};
        position: absolute;
        left: 50%;
        top: 50%;
        width: max-content;
        transform: '${altDirectionFunc}'; // That's what matters
        font-family: ${vars.mainFont};

    }
`;

//

 <StyledTextField size={size} initalValue={initalValue} onChange={handleChange}
        fontFamily={fontFamily} theme={theme} {...otherProps} value={value} dir={direction}/>

However, I don't achive the result I want, there's no difference if I pass altDirection="row" or altDirection="column"

How can I fix it?

P.S. I used the ternary operator before, but this is much more clean. Is it not possible to use functions like that or did I made a mistake?