Allow to convert to time data types for "Time column"

[SvetoforColumb]

Feature Request

Is your feature request related to a problem? Please describe.
I have an issue when I try to use column that stores Unix microseconds as time column. Even if I use TIMESTAMP_MICROS() on column.

also the same problem with raw request

Describe the solution you'd like
Maybe macros should be allowed to have convert functions in it. Or the solution can be adding convert finctions to query builder.

Describe alternatives you've considered
I've tryed to use aliases and inserting convert functions into macros, but it didn't help.

[avivl]

@SvetoforColumb what's the data type of the column that stores Unix microseconds?

[SvetoforColumb]

@avivl integer (INT64)

[avivl]

I did not find any other Grafana data source that supports a calculated column as a time column