I did a couple of quick and superficial Internet searches to get an idea of which USD pairs are being used the most to trade Bitcoin . My conclusion is that the most relevant currencies are the Chinese Renminbi and the Brazilian Real.
Based on that, I wrote this little indicator that uses the exchange rate from the USD pairs ( USDCNY , USDBLR) and the round number targets to come up with the corresponding USD price levels.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.