arrows on STOCHRSI

Hello, all you sophisticated traders. I like STOCHRSI as an oscillator. However, I would really like an arrow on my chart to signal crossover events rather than using my weak old eyes to sort it out on its panel underneath the price chart.

I am largely innumerate, and coding is beyond me. Ideally,

-- I would like to have an up arrow print when the indicator crosses from below 20, to above, and from below 80 to above.

-- I would like to have a down arrow print when the indicator crosses from above 80 to below, and from above 20 to below.

Lots of help and advice, and maybe even people who will do the development all over the place here on NexusFi, but I don't know where to start.

I'd be grateful for help; I do have a thingy called MACDPlus that prints an arrow on the signal line crossover, but I find the STOCHRSI signal to lag price action less. Maybe there's a way to simply add/copy the "arrow" part of the MACDplus code into the STOCHRSI code?

I do have a code from a chap here on NexusFi that prints arrows on the cross of %D and %K, but that is not what I am looking for.

Eager for guidance and support.

Thanks!