Tampermonkey screen input

I am using a online charting platform to analyze crypto currency pairs. Usually the system stores any changes to a trading pair chart, So I can use just one chart template and just change the symbol, and the software will recall whatever settings you had for that pair. Except for one attribute, on Renko charts that I have to input fresh each time I o to a new pair. I set blocksize to some % of current price. Well, instead of doing this everytime, I have had to make separate charts for each pair. So if I ever want to make a change, I have to duplicate the change in over 20 charts. I would rather have one chart and just change the currency pair. ++++++++++++++++++++++ What I need is for someone to make a tamper monkey app, that will allow me to input a global setting for what % I want all blocksizes to be, Then when ever I change charts the app would automatically take the current pair price and take the % of that price and put it in the setting for Renko traditional blocksize setting. That's it.