Hi!
I tried both of your suggestions. The first option did not work for me. I managed to add x and y to my data (and i created a new locator with this data, mapping the values) like you described, but my result was displayed in the same way as before. It is possible i did something wrong along the way.
After this i tried the second option you mentioned. This worked! I can use the seach function that i created in ArcGIS pro as locators within my portal webb map. Now the visualization works as I hoped. I can't seem to rename my "locators" (in the search window they are presented with the dataset names), but that might be a problem for the future.
Thank you so much for your help!