Not sure how accurate it is, but according to the Swagger docs, it looks like the filter functions all take strings (/iias/api/projects). You may be stuck looping through. Is it that you have so many projects you don't want to loop? Or that you don't want to or have the ability to actually write code wherever you're using this?
Filter the results by a specified predicate expression. A set of operators and functions are defined for use:
Operators: eq, ne, gt, ge, lt, le, and, or, not.
Functions:
bool substringof(string p0, string p1)
bool endswith(string p0, string p1)
bool startswith(string p0, string p1)
int length(string p0)
int indexof(string p0, string p1)
string replace(string p0, string find, string replace)
string substring(string p0, int pos)
string substring(string p0, int pos, int length)
string tolower(string p0)
string toupper(string p0)
string trim(string p0)
string concat(string p0, string p1)
