1
What you're describing, while pretty straightforward, simply isn't possible in the standard AGOL Map Viewer. The web web doesn't have capabilities for inter-layer actions like that. In a custom web map built with the Arcgis JavaScript API, it would be simple, but probably involves more coding than you're looking for.
If you want an off-the-shelf option that ...
1
You can use the format() method to include specific values inside your strings. Furthermore, I think the field name does not have to be inside quotes but I may be wrong. You could write the following inside your for loop:
for row in cursor:
fid = row[0].zfill(4)
query = '''FID_{}_T <> -1 AND FID_{}_L <> - 1'''.format(fid, fid)
arcpy....
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