This Excel LAMBDA function provides a FORMULATEXT capability for Python in a Python cell

excel-lambda-FORMULATEXT.PY.txt

/*
    Provides a FORMULATEXT capability for Python cells

    pythonCell: A reference to a Python cell
    [asArray]: A TRUE/FALSE value indicating whether 
                or not to spill the results of the formula
                default is TRUE
*/
FORMULATEXT.PY = LAMBDA(pythonCell,[asArray],
    LET(
        _asArray,IF(ISOMITTED(asArray),TRUE,asArray),
        step0, FORMULATEXT(pythonCell),
        step1, TEXTAFTER(step0,"PY("""),
        step2, LEFT(step1,LEN(step1)-4),
        step2Arr, TEXTSPLIT(step2,,CHAR(10)),
        IF(_asArray,step2Arr,step2)
    )
);