How to execute heightmap file contents into a resource

hello I just released my new map for fivm, it’s called creative house. this map contains a swimming pool where you can swim. however, the server would have to execute the contents of the heightmap.dat file (modifier), so that we could swim in the pool. otherwise, the player goes underwater without swimming. I do not know how to do. I tried to edit the client.lua file, but I have no programming knowledge. If anyone knows a solution please let me know.