It is a very common and crucial requirement to filter records in the subgrid based on some dynamic criteria, for example value from the form field. But as of today, there is no supported way to achieve this.

Very common solution for this problem was utilizing undocumented setFilterXml function available on the grid control, which worked well with legacy read-only/editable grids. But after switching to modern "Power Apps grid control", setFilterXml function introduces unexpected issues with infinite scrolling and filtering by fields from related columns.

In order for mentioned issues to be fixed and to safely migrate from legacy controls to "Power Apps grid control", official support for setFilterXml function should be introduced first.

Thank you.